ITEM NAME:2x Bicycle Axis BB Bottom Bracket Medium Shaft Bearing Protection Cup Covers Description: 2 Pieces premium bicycle bike medium shaft bearing protection cover. Waterproof and dustproof Smooth surface, good hand feeling, corrosion-resistant and wear-resistant Without use tools, press manually and install it, it is very convenient, after the crank is locked, there will be no slack. Suitable for crankshaft diameter 24mm. Specification: Material: Plastic Size: Approx. 36.5x25x24mm/1.43x 0.98x 0.94inch Inner Diameter: Approx. 4mm Color: Black Package Includes: 2 Pieces Protection Cover Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement. SKU: DMO0010057354044959.Smooth surface, good hand feeling, corrosion-resistant and wear-resistant. 2 Pieces Protection Cover. Material: Plastic. Without use tools, press manually and install it, it is very convenient, after the crank is locked, there will be no slack.