Metric Thread Identifiers contain nut and bolt sizes M4x0.7, M5x0.8, M6x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.50, M12x1.25, M12x1.5, M12x1.75. Customers are also appreciative that all of the bolt plugs have both a male and female part. This makes it easy to indefinive both threads and bolt head sizes. The Cons You can buy tyre tread gauges that help you assess the tread depth of the tyre, plus you can also get more basic colour-coded tools that let you know if a tyre is legal or not at a glance. Driving with tyres that have a tread below the legal limit - or even worse, are bald - is dangerous. For more information about tyres read our complete guide to tyre buyingor our complete guide to tyre safety and maintenance.

Thread Checker (Complete SAE/Inch and Metric Set) Nut and Bolt Thread Checker (Complete SAE/Inch and Metric Set)

The difference in wet braking distance between a tyre worn to 3mm and one worn to 1.6mm can be as much as 44%.

Thelegal tyre tread depth for cars in the UK and Europe is 1.6mmacross the central three-quarters of the tyre, according to law.

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Tyre and safety experts believe the 1.6mm legal minimum is insufficient to guarantee safety – most recommend a minimum tread depth of 3mm for tyre replacement. Any insurance claim as a result of an accident could be invalidated, so potentially your insurer won't pay out any money any repairs needed to your vehicle. Metric Thread Identifiers contain nut and bolt sizes M1.2x0.25, M1.6x0.35, M1.6x0.20, M1.8x0.35, M2x0.40, M2x0.25, M2.5x0.45, M2.5x0.35, M3x0.35, M3x0.50, M3.5x0.60, M3.5x0.35. Inch Thread Identifiers contain nut and bolt sizes 1-64, 1-72, 2-56, 2-64, 3-48, 3-56, 4-40, 4-48, and 5-40. If there’s less tread depth, less water can be shifted, increasing the risk of aquaplaning and losing grip.

Some tyres will have indicators embossed on the tyre wall itself, usually with a line or arrow which is positioned somewhere below the outer tread.