Description:Material: Made of good quality aluminum alloy material, anti rust, high strength, sturdy and durable, colorfast, lightweight

Functional: used fix the crank and crank of the sprocket

Washer: Use double washer, Compatible with 21-23mm inner diameter cranksets

Wonderful Accessory: for bike chain wheel, used fix the crankset and crank of the chain wheel, Tighten, seal, and waterproof

install: crank arm Bolt is wonderful part for your broken or old ones

Universal: Can be applied for mountain bikes, road bikes, etc

Specification:Material: Aluminum AlloySize: 1

8cm/0

71inchPackage Includes:1 Bikes Crankset Screw