Spiral 7075 Alloy Chainring bolt kits include five 8.5-mm front bolts, five 6-mm front bolts and five 5-mm rear nuts so they will fit just about any chainring/crank combination, including those with threaded holes 7075-T6 alloy construction with laser engraved logos Includes: 5 - 8.5mm front bolts 5 - 6mm front bolts 5 - 5mm rear nuts Variable 7075AL Black