What is the difference between 6-point and 12-point ring wrenches?

Twelve points allow positioning at smaller angles, which helps in tight spaces. Six points spread the torque over wider faces and are far less likely to round a seized bolt.

Why do open-end wrenches round bolt heads?

They grip only two faces, so under high torque the load concentrates on two corners. On seized bolts, use a ring end or a socket.

Which size range do I need?

8-19 mm covers most automotive work; 6-32 mm covers general machine maintenance. Choose a set by that coverage rather than by piece count.

Can I use a metric wrench on an imperial bolt?

You should not. The size difference leaves play, rounds the head and spreads the jaw. Imperial work needs its own set.

What is a ball-end hex key for?

The ball end lets you reach a screw at an angle, typically up to 25-30 degrees. Use the straight end for high torque — the ball reduces the contact area when angled.

How should a wrench set be stored?

Dry, and preferably in its own case. Chrome plating slows corrosion but joints and faces can still rust in a damp environment.

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Wrench Sets

Wrench sets are the basis of tightening and loosening bolts. Two things decide the choice: which sizes are in the set, and how the jaw geometry grips the bolt head. The range here covers combination, open-end, ring and hex key sets.

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Jaw types and torque transfer

An open-end wrench grips two faces of the bolt and slides in from the side in tight spaces, but it is also the type most likely to round a head under high torque. A ring wrench surrounds the bolt and transfers torque through six or twelve points — the versions that bear on the flats rather than the corners protect the head.

A combination wrench has one of each: start on the ring end to break the bolt free, then spin it off with the open end. Open-end geometry is defined by DIN 3113.

Type	Grip	Strength
Open-end	Two faces	Tight spaces, side access
12-point ring	Twelve points	Positioning at small angles
6-point ring	Six faces	High torque, seized bolts
Hex key	Internal hexagon	Socket head screws

Judge a set by its sizes

A set is worth what its sizes are worth, not what its piece count says. Automotive work lives between 8 and 19 mm; general machine maintenance between 6 and 32 mm.

Wrench numbers are the jaw opening in millimetres: a 13 fits a 13 mm head. Imperial fasteners need an imperial set — forcing a metric wrench onto an inch bolt damages both.

Frequently Asked Questions

What is the difference between 6-point and 12-point ring wrenches?
Twelve points allow positioning at smaller angles, which helps in tight spaces. Six points spread the torque over wider faces and are far less likely to round a seized bolt.
Why do open-end wrenches round bolt heads?
They grip only two faces, so under high torque the load concentrates on two corners. On seized bolts, use a ring end or a socket.
Which size range do I need?
8-19 mm covers most automotive work; 6-32 mm covers general machine maintenance. Choose a set by that coverage rather than by piece count.
Can I use a metric wrench on an imperial bolt?
You should not. The size difference leaves play, rounds the head and spreads the jaw. Imperial work needs its own set.
What is a ball-end hex key for?
The ball end lets you reach a screw at an angle, typically up to 25-30 degrees. Use the straight end for high torque — the ball reduces the contact area when angled.
How should a wrench set be stored?
Dry, and preferably in its own case. Chrome plating slows corrosion but joints and faces can still rust in a damp environment.