Features: Protect your bike's bottom bracket bearings from dusts and water with Bottom Bracket Protections Cap . Made of durable engineering plastic, this cap is lightweight and fit crank diameters of 24mm/0.94inch. No need to use tools, manually press in and install it, it is very convenient, after the crank is locked, there will be no looseness. Upgrades your bike's performances and extend the servicelife of your bearings with this simple yet effective solution. Waterproof and dustproof. Smoothsurface, good hand feeling, -resistant and wear-resistant. Specifications: Material: Plastic Size: As Shown in the Picture Package Includes: 5pcs Bearing Dustproof Protect Cover note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.