Made of high quality anodized Aluminum. Compared with the bottom bracket tool made of ordinary materials, it is strong and durable. It has excellent anti-corrosion and anti rust performance and long service life. Application:Suitable for bb80, bb5700, bb70, BB51, , , megaexo, hope, SRAM / GXP, X-type, , wheels, , etc Installation requirements: ratchet / torque wrench compatible with 3 / 8 inch drive. size: Product outer diameter: 50mm Inner diameter: the distance between convex points is 42.54mm, and the distance between concave points is 46.83mm Aplicacin: 1, Compatibilidad: Compatible with for 16-slot bottom bracket tooling accessories, rated for 44mm OD Fits for BB80, BB5700, BB70, BB51 and previous external bearing threaded cups Also fits for many external thread types such as , , MegaExo, Hope, SRAM/ GXP, X-style, , Wheels, and more Fits 16-slot rotor disk lock rings Precision CNC machined aluminum, anodized and laser engraved for easy identification, features ratchet/torque wrench compatible 3/8inch drive 2,Applicable model: Suitable for bb80, bb5700, bb70, BB51,, , megaexo, hope,SRAM / GXP, X-type, , wheels, , etc Material:aluminum colour:blue Package Contents: 1 x 16- Bottom Bracket Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.