Wolf Tooth Set of Chainring Bolts for 104 x 30T Rings (10 mm long) 4-PiecesThese bolts are designed as a direct fit for 30 Tooth x 104 BCD threaded chainring. These are alloy bolts with 4mm hex heads and 10mm length. Designed for M8 x . 75 thread pitch 10mm long 4mm hex head Bolt length is laser engraved onto the bolt head for easy length identification 6 7 Nm installation torque with light grease on threads only Material: Aluminum Type: Hex Length: 10