Bike Crank Arm Fixing Bolt Cap Aluminum Alloy MTB Shimano Crank Nut M18 M20
Durable aluminum alloy crank arm fixing bolt and cap set for MTB bikes. Compatible with Shimano crank systems, available in M18 and M20 sizes. M18：About 7g. M20 crank cover screws are suitable for Shimano kits such as: M4000, M590, M596, M661, SLX, XT, XTR, etc.