- Durable construction: made from 6061 aluminum alloy with T6 heat treatment for increased hardness and resistance to deformation. Built to withstand repeated use without the jaws opening or bending under torque. - Precise fit for common bottom brackets: fits BSA chassis with 16x notched rotor disc grooves and circlips. Compatible models include BB51, BB70, BB80, BB5700, FSA MegaExo, Hope, SRAM/TRUVATIV GXP, RACE FACE X-type, PROWHEEL and similar systems. Specifically designed for DUB, TL-FC32, TL-FC24 and TL-FC25 bottom brackets. - Makes maintenance faster and safer: the exact engagement with 16-notch rings prevents slippage and damage to the BB cup or tool, so you can apply torque cleanly and avoid rounding parts. - Compact and portable: lightweight, compact design is long enough to give good leverage while remaining small enough to carry on rides or keep in a workshop tool roll. Easy to transport for on-site repairs or mobile mechanics. - Wide professional use: suitable for bicycle workshops, factory assembly, and personal bike overhaul or maintenance. Durable alloy and accurate fit make it appropriate for repeated shop use or occasional home repairs. Typical use scenarios 1) Removing and installing a SRAM/TRUVATIV GXP or FSA MegaExo bottom bracket during a road bike service—precise engagement reduces risk of cup damage. 2) On-the-road repair for a mountain bike equipped with DUB or TL-FC series bottom brackets—compact size fits in a saddle bag or tool pouch and provides enough leverage to loosen tight cups. 3) Routine shop maintenance and assembly in a bike workshop or factory line where consistent, repeatable fit and durability are needed for many BB changes. What you get - A single, high-strength 6061-T6 aluminum bottom bracket wrench designed for 16-notch BSA-style bottom bracket rings and the listed BB standards and models.