Hardware kit to float one brake rotor, 8 bolts. Works with Stoptech brake rotors that are 298x20mm, 280x20mm or 280x18mm. (Pin kits with longer bobbins available for bigger rotors.) Kit contains, bobbins, socket head cap screws and flat washers as well as the locking compound. It is recommended to always change hardware when replacing a brake rotor. Bobbins will locate into the rotor adapter and the head will seat against a step in the adapter. Once installed rotor should have a small amount of free play both axially and radially. Torque to 67-72 In-Lbs and apply Loctite 290 after assembly, supplied with kit.