Made of high-quality anodized aluminum. Compared with bottom bracket tools made of ordinary materials, it is strong and durable. It has excellent anti-corrosion and anti-rust performance and a long service life. Application: Suitable for BB80, BB5700, BB70, BB51, MegaExo, Hope, SRAM/GXP, X-type, wheels, and other compatible systems. Installation requirements: Compatible with ratchet or torque wrench with 3/8 inch drive. Size: Product outer diameter: 50mm Inner diameter: Distance between convex points is 42.54mm, distance between concave points is 46.83mm Features: - Compatible with 16-slot bottom bracket tooling accessories, rated for 44mm OD - Fits BB80, BB5700, BB70, BB51, and previous external bearing threaded cups - Also fits many external thread types such as MegaExo, Hope, SRAM/GXP, X-type, wheels, and more - Fits 16-slot rotor disk lock rings - Precision CNC machined aluminum construction - Anodized finish with laser engraving for easy identification - Equipped with 3/8 inch drive for use with ratchet or torque wrench Material: Aluminum Color: Blue Package Contents: 1 x 16-Slot Bottom Bracket Tool Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3cm.