Description: Separated washer design reduces resistance and brings smooth output. CNC workmanship makes it lightweight to reduce pressure. Gapless design makes it well-sealed to prevent water and dust from entering. Thread and screw-in type design makes it easy to use. Made of quality aluminium alloy material, it has wear resistance and high strength. It has high speed rotation bearing and built-in spring to support sliding gap. Lightweight shell makes the crank power transmission more direct. It is suitable for mountain bikes and road bikes. Item Name: Thread Bottom Bracket Material: Aluminum Alloy Features: Good Sealing, Screw-in Type, High Strength Size Details: Size: 9.7cm x 4.4cm/3.82" x 1.73" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Thread Bottom Bracket 3 x Washers Separated washer design reduces resistance and brings smooth output. CNC workmanship makes it lightweight to reduce pressure. Gapless design makes it well-sealed to prevent water and dust from entering. Thread and screw-in type design makes it easy to use. Made of quality aluminium alloy material, it has wear resistance and high strength. It has high speed rotation bearing and built-in spring to support sliding gap. Lightweight shell makes the crank power transmission more direct. It is suitable for mountain bikes and road bikes.