This is a top - notch Shimano Clamp Bolt with a washer, sized M6 X 21. It's specially designed as Shimano Crank Arm Fixing Bolts, ensuring stable and reliable performance for your bike.

Using this Shimano clamp bolt with washer is easy. First, make sure the surface where you'll install it is clean. Then, carefully align the bolt with the crank arm and use a suitable tool to tighten it. Remember not to over - tighten as it might damage the parts. When it comes to maintenance, check the bolt regularly for any signs of wear or looseness. If it gets dirty, simply clean it with a soft cloth. Keep it in a dry place when not in use to prevent rusting.