This is a tool used for centering adjustment of disc brakes. I accidentally purchased multiple sets, so I am selling the ones I don't need. If you want to save on labor costs and time without relying on a shop, please consider this! (Product Contents) Two types in a set will be sent. You can use them according to the rotor shape. (Specifications) Material: 304 Stainless Steel Size: Approx. 85*14*2.4mm Approx. 55*19*2.4mm (How to Use) 1. Loosen the caliper bolts. 2. Insert the tool into the rotor. 3. Move the tool to the position where it contacts the pads. 4. Tighten the caliper bolts at the position where the rotor is centered. Disc Brake DB Road Bike Mountain Bike Tool Tools Disc Rotor Caliper Maintenance