The size used to describe a spanner/wrench is the distance across the flats of the nut or bolt to be turned. There are two systems in common use, metric, in millimeters, and imperial, in inches. Each of the systems has a range of spanners/wrenches especially made for each one. The systems can be identified on the spanner/wrench by either a number for metric spanners, or a fraction followed by A/F.

Spanners are one of the most useful tools to have in your workshop or toolbox, many jobs around the home will need them and if you are tackling jobs under the bonnet of your car you are certainly going to need some.

Most people will have the basic tools around the home such as screwdrivers and wrenches or pliers, but sooner or later you will need a good spanner set.

A spanner set will be more beneficial than just buying individual spanners as most sets will cover the most common sizes used on car engines. If you do find yourself short on the right size then a good adjustable spanner should get the job done.

Opened ended sets will give you more size choices as each end has a different size, where as the combination spanner only offers one size per spanner.

But they can make the job a whole lot easier as the ring will allow you to apply more pressure and at the same time not slip of any tight nuts and bolts.

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    10 piece Extra Long Double Ring Single Gear Ratchet Spanner Wrench Set With Adapters 8 – 19mm

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    Home Workshop 13mm Chrome Vanadium Combination Spanner