Suzuki RMZ and Kawasaki KX/KX-F rotor bolt kit fastens both front and rear rotors, includes four M6x13 mm front rotor bolts and four M8x15 mm rear rotor bolts. Yamaha YZ/YZ-F rotor bolt kit fastens both front and rear rotors, includes six M6x16 mm rear rotor bolts and six M6x12 mm front rotor bolts.