Features: 1. High Quality Material: CNC aluminum alloy housing light weight aluminum shaft housing makes the power transmission of crank more direct no power loss and bearing damage caused by plastic elasticity with excellent rigidity wear resistance and high strength. 2. Additional Advantage: Separated nylon collar double side sliding function will not increase the rotational resistance of the bearing and high output smoothness. 3. Waterproof: Sealed waterproof bearing high speed bearing bearing built-in spring support sliding gap no gap design to prevent soil and rain from entering the bearing with good waterproof performance. 4. Excellent Bike Parts: Integrated system can protect the frame higher power it is better than ordinary intermediate motion structure. 5. After-sales Service: If you have any problem please contact us immediately we will help you solve it as soon as possible. Specifications: Material: Aluminum alloy Specification: 46mm Applicable Shaft: 30mm Length: 68- 73mm Weight: Press-in approx. 117g lock approx. 126g Suitable for: PF30 68/73mm 46mm frame housing 30/30mm spindle crank set includes: 1 *Shaft