ITEM NAME:Engineering Bicycle Bottom Bracket Bearing Cover Protective Features: Applicable Usage: Suitable for bearings with an inner diameter of 25mm and crank shafts with an outer diameter of 24mm. Installation Place: Can be installed on the middle axle and bottom bracket. Material: Made of engineering plastic material, durable and not easy to break. Function: Can be used for waterproof, dustproof and improving bearing life. Easy Installation: Without tools, press manually and install it. After the crank is locked, there will be no slack. Specifications: Material: Engineering Plastic Color: Black Size: About 36.5x9.4 mm(Bottom Diameter*Total Height) Bottom Height: About 1.3 mm Thickness: About 1 mm Inner Diameter: About 24 mm Outer Diameter: About 25 mm Package Included: 2pcs*&;nbsp;Bearing Cover Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement..Installation Place: Can be installed on the middle axle and bottom bracket. Function: Can be used for waterproof, dustproof and improving bearing life. 2pcs &;nbsp;Bearing Cover. Material: Made of engineering plastic material, durable and not easy to break.