red color Product attributes: The T47 Dual Bottom Bracket Wrench features a 16 and 12 notch interface with an interchangeable adapter to support different T47 bottom bracket standards. All bottom bracket socket models are precision CNC-machined tools for installing and removing a variety of external bottom bracket cups. They're made of aluminum and anodized red for a durable finish and precise fit that won't damage aluminum external bottom bracket cups. Knurling on the side of the socket provides a better grip when hand-tightening, and the 1/2˝ drive allows for easy use with torque wrenches, ratchets, and knobs.