These 6mm long bolts are designed for single-chainring (1X) usage and use a double hex head interface so you don't have to use a chainring nut spanner. Not to mention they look very exceptional. Features: 6mm length Made in the US out of 7075 Aluminum Alloy Has hex heads on both the bolt and nut for easy installation Max torque of 7-8 Nm with light grease on threads only Specifications: Material: 7075-T6 Weight: 5 bolts = 12g