What is the difference between HSS and HSS-Co?

HSS-Co is high speed steel with 5-8% cobalt added. It holds its hardness better when hot, which suits stainless steel and cast iron. In return it is more brittle and less tolerant of impact.

Do coated bits really last longer?

Yes, but the coating does not change the base material. It raises surface hardness and stops swarf sticking, which allows higher speeds and longer life. It will not compensate for the wrong bit material.

Can SDS-plus and SDS-max bits be interchanged?

No. The shanks are 10 mm and 18 mm and the holders do not match. SDS-plus covers 4-30 mm holes; SDS-max belongs to heavy drilling and breaking.

Hole saw or large twist drill?

Above roughly 16 mm a hole saw is faster and needs far less power: it cuts only the circumference and ejects the slug whole, while a twist drill turns the whole disc into swarf.

What speed should I drill metal at?

Lower as the diameter grows, with cutting fluid. At high speed the bit overheats, the cutting edge softens and the sharpness is gone for good. Hard materials want low speed and steady, sufficient pressure.

What drills tile and granite?

Diamond bits. Diamond abrades rather than cuts, so work with hammer action off and water cooling where specified. Glass and wall tiles also take spear-point carbide bits.

What is the difference between PH, PZ and TX driver bits?

The recess geometry in the screw head. PH (Phillips) and PZ (Pozidriv) look alike but differ, and a PH bit in a PZ screw cams out and ruins the head. TX (Torx) is a six-point star that transmits high torque.

Why do my driver bits keep camming out?

Usually the wrong type or size (PH1 instead of PH2), working off the screw axis, or using standard bits in an impact driver. Impact drivers need impact-rated bits.

What decides the choice of tap and die?

The thread size and pitch (M8x1.25 and so on) and the workpiece material. Before tapping, the tapping hole must be drilled to the correct diameter: the wrong diameter either leaves a shallow thread or snaps the tap.

What do the DIN numbers on bits mean?

They classify length and geometry. On metal drills, DIN 338 is the standard jobber length, DIN 1897 the stub series and DIN 340 the long series; DIN 352 covers hand taps, and ISO 1173 / DIN 3126 define driver bit shanks.

How does wholesale purchase and dealership work?

Send a size list by diameter and length with quantities; we return stock, wholesale pricing and lead time together. Dealer terms are available for businesses buying consumables regularly.

Mixed sets or individual sizes?

Workshops using the same size continually are better served by singles and bulk packs; service and maintenance work, which needs variety, is better served by a set. What sizes a set contains matters more than how many pieces it has.

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Drill Bits & Accessories

Choosing a bit is a decision made far more often than choosing a machine, and one whose result shows immediately: the right bit finishes the job in minutes, the wrong one overheats, dulls and spoils the work. This page explains the groups, what bit material and coating actually mean, and how the shank systems divide. The catalogue holds over 6,000 bits and accessories across 26 groups.

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The groups and what they cut

Bits divide by the material they drill or cut. Between two bits of the same diameter the difference lies in the substrate material, the point angle and the shank — and that last one also decides which machine they fit.

Group	Material	Shank / mount	Typical work
Metal drill bits (HSS)	Steel, aluminium, plastic	Cylindrical	Drilling metal, assembly
Wood drill bits	Timber, MDF, plywood	Cylindrical / hex	Hinges, through holes
Masonry bits (SDS-plus)	Concrete, brick, stone	SDS-plus 10 mm	Anchors, plugs, services
Masonry bits (SDS-max)	Concrete, reinforced concrete	SDS-max 18 mm	Heavy drilling, demolition
Hole saws	Sheet, timber, plasterboard	Arbor + pilot drill	Large diameter holes
Taps & dies	Steel, cast iron	Wrench / bench	Cutting threads
Router bits	Timber, MDF, aluminium	Collet (6/8/12 mm)	Grooves, profiles, edges
Driver bits	Screw heads	1/4" hex	Driving screws, assembly
Saw blades	Timber, metal, plastic	Machine specific	Cutting

Bit material: HSS, HSS-Co, carbide, diamond

What the bit is made of decides how hard a material it will cut and how much heat it survives. HSS (high speed steel) is the general purpose standard. HSS-Co adds 5-8% cobalt: it holds its hardness better when hot, which is why it belongs in stainless steel and other materials that heat up.

Carbide (tungsten carbide) is far harder but brittle: it resists wear rather than impact, which is why it appears as a brazed tip on masonry bits or as a solid carbide router cutter. Diamond does not cut at all — it abrades, which is what tile, glass and concrete need.

Material	Where	Limit
HSS	Steel, aluminium, plastic, timber	Not enough for hardened steel
HSS-Co (cobalt)	Stainless, cast iron, hot work	Brittle; never use on hammer mode
Carbide (TCT)	Concrete, sheet, laminate, aluminium	Sensitive to impact and drops
Diamond	Tile, granite, glass, concrete	Will not cut metal
Bimetal (BiM)	Hole saws and saw blades	Slower than carbide

What a coating does

A coating does not change what the bit is made of; it raises surface hardness and stops swarf welding to the flutes. That extends life and allows higher speeds. It will not rescue the wrong base material.

Bright (uncoated): general purpose, cheapest.
Steam (black oxide): lower friction, corrosion protection.
TiN (gold): higher surface hardness, longer life.
TiAlN (dark grey/violet): works hot, for stainless and hard steel.

Shanks and mounting

How a bit mounts decides which machine it fits. Masonry bits are not clamped in a chuck: they lock into an SDS holder and stay free along their axis so the hammer blow reaches the tip.

SDS-plus has a 10 mm shank covering 4-30 mm holes; SDS-max has an 18 mm shank for heavy machines. Driver bits take a 1/4" hex holder, and router cutters mount by collet size (6, 8, 12 mm).

Mount	Size	Where
Cylindrical	By bit diameter	Chuck drills
SDS-plus	10 mm shank	Rotary hammers, 4-30 mm holes
SDS-max	18 mm shank	Heavy rotary hammers
1/4" hex	Standard bit holder	Drivers and impact drivers
Collet	6 / 8 / 12 mm	Routers

Three things that decide bit life

Two people can get very different mileage from the same bit, and the difference is almost always speed, feed and cooling. In metal, drop the speed as diameter rises; too fast burns the cutting edge and ends its life for good.

Speed: lower as diameter grows, lower again in hard material.
Feed: steady and sufficient — rubbing without cutting dulls the edge.
Cooling: cutting fluid in metal, water on diamond bits where specified.
Impact: never run HSS or carbide bits in hammer mode.

Wholesale supply from Seza Global

We supply Bosch, Makita, Milwaukee, Karbosan, Drebo and Three Files bits and accessories wholesale. From metal and wood drills to SDS masonry bits, hole saws, taps and dies, router cutters and driver bits, the range covers over 6,000 products across 26 groups.

For dealer and bulk purchase, send the size list and quantities; consumables are quoted from diameter and length lists, so stock, pricing and lead time come back together.

Frequently Asked Questions

What is the difference between HSS and HSS-Co?
HSS-Co is high speed steel with 5-8% cobalt added. It holds its hardness better when hot, which suits stainless steel and cast iron. In return it is more brittle and less tolerant of impact.
Do coated bits really last longer?
Yes, but the coating does not change the base material. It raises surface hardness and stops swarf sticking, which allows higher speeds and longer life. It will not compensate for the wrong bit material.
Can SDS-plus and SDS-max bits be interchanged?
No. The shanks are 10 mm and 18 mm and the holders do not match. SDS-plus covers 4-30 mm holes; SDS-max belongs to heavy drilling and breaking.
Hole saw or large twist drill?
Above roughly 16 mm a hole saw is faster and needs far less power: it cuts only the circumference and ejects the slug whole, while a twist drill turns the whole disc into swarf.
What speed should I drill metal at?
Lower as the diameter grows, with cutting fluid. At high speed the bit overheats, the cutting edge softens and the sharpness is gone for good. Hard materials want low speed and steady, sufficient pressure.
What drills tile and granite?
Diamond bits. Diamond abrades rather than cuts, so work with hammer action off and water cooling where specified. Glass and wall tiles also take spear-point carbide bits.
What is the difference between PH, PZ and TX driver bits?
The recess geometry in the screw head. PH (Phillips) and PZ (Pozidriv) look alike but differ, and a PH bit in a PZ screw cams out and ruins the head. TX (Torx) is a six-point star that transmits high torque.
Why do my driver bits keep camming out?
Usually the wrong type or size (PH1 instead of PH2), working off the screw axis, or using standard bits in an impact driver. Impact drivers need impact-rated bits.
What decides the choice of tap and die?
The thread size and pitch (M8x1.25 and so on) and the workpiece material. Before tapping, the tapping hole must be drilled to the correct diameter: the wrong diameter either leaves a shallow thread or snaps the tap.
What do the DIN numbers on bits mean?
They classify length and geometry. On metal drills, DIN 338 is the standard jobber length, DIN 1897 the stub series and DIN 340 the long series; DIN 352 covers hand taps, and ISO 1173 / DIN 3126 define driver bit shanks.
How does wholesale purchase and dealership work?
Send a size list by diameter and length with quantities; we return stock, wholesale pricing and lead time together. Dealer terms are available for businesses buying consumables regularly.
Mixed sets or individual sizes?
Workshops using the same size continually are better served by singles and bulk packs; service and maintenance work, which needs variety, is better served by a set. What sizes a set contains matters more than how many pieces it has.