describe Plastic probe: plastic probe, easy to measure, can measure tire tread 0-20mm Plastic ruler: high-quality ABS material, easy to carry, wear-resistant and fall-resistant Clear scale: clear scale font, digital reading + scale reading, secondary calibration lider design: easy to measure tire depth, easy to operate, ergonomic design Size: 45*43mm, 4 tire depth gauges, orange Product Features Plastic probe: plastic probe, easy to measure, can measure tire tread 0-20mm Plastic ruler: high-quality ABS material, easy to carry, wear-resistant and fall-resistant Clear scale: clear scale font, digital reading + scale reading, secondary inspection Slider Design: Easy to measure tire depth, easy to operate, ergonomic design Size: 45*43mm, 4pcs tire depth gauge, orange tire depth gauge Range: 0-20mm Material: ABS Weight: 12g Difference: +/- 0.1mm tire replacement advice 1. The tire wear limit is less than or equal to 1.6mm, it is recommended to replace 2. The running wear of summer tires is less than or equal to 3mm, it is recommended to replace 3. Winter tires wear less than or equal to 4mm, it is recommended to replace Package contains 4*Tire depth gauge (orange)