Description: Material: 7075 aluminum alloy, high strength, sturdy and durable, higher oxidation resistance, anti corrosion and not easy to rust. Lightweight design: The stiffness increases while reducing the weight, making it easier to ride. Application: The Bottom Bracket must be threaded external hanging type, the bottom bracket width 68/73 can be installed. Note: Press fit and embedded bottom brackets cannot be used. Include: 1pc body, 3pcs long bolts, 3pcs short bolts, 6pcs shim. Specification: Material: CNC 7075 Aluminum Alloy Spec: ISCG ISCG05 compatible Size: 68.3mmx67.9mmx35.4mm/2.69inchx2.67inchx1.39inch Thickness: 4mm Weight: 44.6g Package Includes: 1 Piece ChainGuide Adapter Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!