Feature:1. Aluminium Alloy: These bike front and back calipers and rotors adopt aluminium alloy material, which ensures high stability of brakes.2. Direct Transmission: The aluminum alloy bracing wire arm of force, the force transmission is more direct and does not break, neat and not easy to loose.3. Rectangular Opening: The wire adjuting tuning knob, and the brake is more compact. The long rectangular opening, easy to install and disassemble the brake lining.4. High Efficiency: The long rectangular opening is convenient, quick and efficient to replace the brake lining, shorten the brake route and maintain the brake feel.5. Perfect Set: You will receive front and back calipers and 2 pieces of 160mm rotors. 2 hex wrench and 12 screws are included in the package.Specification:Item Type: Bike Disc Brake KitMaterial: Aluminium AlloyProduct Color: BlackSpecifications: Front Brake: F160-R140. Rear Brake: F180-R160Calipers Size: A Column 74.2mm / 2.92in, B Column 51mm / 2.01inRotors Size: Diameter 160mm / 6.30in, Thickness 1.8mm / 0.07in, Hole Spacing 44mm / 1.73in.Package List:1 x Front Caliper1 x Back Caliper2 x Brake Rotors2 x Hex Wrench12 x Screw