Chainring bolts are an integral part in the drivetrain system. If these fail as your're cranking down the 5m hill then it'll be your face doing the braking! This set of set of 5 Answer 7075-T6 aluminium chainring bolts are 8mm long to accommodate today’s thicker style of chainrings.This kit bolts-up nice and sturdy to your sprocket and spider, and will give you lots of gates and straights of full-throttle giddy-up. Only got a 4 bolt spider? Then you got a spare bolt.