Item Descriptions:-The bicycle crank dust cap is used to fix the sprocket crankset and crank, which is very practical?providing super support and protection for your bicycle.-Made of aluminum alloy, anodized, CNC precise positioning, strong and reliable, not easy to rust, and has a long service life.-The edges are chamfered and polished, which does not hurt your hands and has no burrs. The black appearance is restrained and elegant.-The bicycle crank crank arm mounting bolts are convenient and easy to use, making it easy to install whether it's a mountain bike or a road bike.-Our packing Including 1x Crank Arm Bolt,1x Self-Extracting M18/M30 DUB,1x Gasket.Package:1x Crank Arm Bolt1x Self-Extracting M18/M30 DUB1x GasketItem Specifications:Diameter:18mm bolt/30mm capMaterial:Aluminium AlloyColour:Black