Features: Process: T6 heat treatment, full CNC machining, sanding and polishing, anodizing Features: aluminum alloy lightweight design, matte polishing, precision wire cutting, fully closed loop occlusion, not simple to slide teeth, and will not damage the bottom bracket Tool-a: suitable for using the bottom bracket with an outside diameter of 44mm and 16 cogging. This model is the most common specification of the bottom bracket. (Bb51/bb52/bb70/bb71bbr60/mt800/rs500/mt500, etc.) Tool-b: suitable for the bottom bracket with an outside diameter of 46mm and 24 notches. Suitable for bottom bracket with an outer diameter 46mm 24 notches. (Bbr9100/for xtr/da/s x am/dub) Specifications: Material:Aluminum Alloy Size:25x6.4cm/9.84x2.52in Note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 2 x Wrench