Specifications: Using aluminum alloy material, while maintaining the characteristics of lightness, so it features high strength and light weight. We use groove-sealing technology to greatly improve the sealing performance of the drainage, while reducing the sealing resistance, and the appearance is more high-end. Separate nylon washer has double-side sliding feature, which will not increase resistance to the rotation bearing, and has high lubricity and good water resistance. The aluminum alloy shaft bushing makes the crank power transmission more direct, without plastic elasticity causing power loss and bearing damage, and has better rigidity. It is applicable for mountain bike, road bike, folding bike, etc. Item Name: Bike Bottom Bracket Material: Aluminum Alloy, Nylon Application: 68-73 Bottom Bracket Features: Durable, Easy to Install, Bike Parts Size: Height: 9.7cm/3.82", Outer Washer Diameter: 4.4cm/1.73", Inner Washer Diameter: 2.4cm/0.95" (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 Bike Bottom Bracket 3 x Nylon Washer