Brake Disc Calliper: Mainly made of strong and durable Aluminium material for a long service life. Tyre Tread Depth Gauge: Small size and light weight is easy to carry in a bag or take outdoors. Brake Disc Thickness Ruler: Suitable for accurate measurement of brake disc thickness. Tire Tread Depth Caliper: Has Metric Scale Display for easy, intuitive and reliable Reading. Use scenarios In a vehicle service workshop: Use for routine brake and tyre inspections on cars, motorcycles, and light trucks. Check brake disc thickness and tyre tread depth to assess safety and determine service needs. On the road or at a job site: Keep this compact toolkit handy for roadside checks during long trips or fleet maintenance. Quickly verify tyre tread depth and brake disc thickness to decide if a service stop is required. In a DIY or home garage: For maintenance tasks, including brake disc and tyre inspections, with a portable setup that fits into a small toolbox or bag for easy transport.