Standard Tyre Tread Gauge is a simple and practical device that checks whether your tyre tread depth is within the legal limit. This item comes complete with a keyring or ball chain fitting. Made in the UK from recycled plastic. ...Printed full colour using a digital process. Plastic material is available in 8 standard colours, we offer the cost saving of manufacturing and printing onto white plastic, prices given are for white plastic item printed up to full colour, if a coloured plastic product is required. We can pantone match product at additional cost.