Unior Bottom Bracket Socket T47 1671.T47 T47 double-sided bottom bracket cup with 16 and 12 notch interface with interchangeable adapter to cover all different T47 bottom bracket standards. All bottom bracket socket models are precision CNC-machined tools for installing and removing various external bottom bracket cups. They are made from billet aluminum and anodized red for a durable finish and precise fit, which will not damage aluminum external bottom bracket cups. Knurling on the side of the socket provides better grip when hand-threading cups, while the 1/2" square drive makes it easy to use with torque wrenches, ratchets, and fixed handles. Unior Article Number: 722104 EAN-code: 3838909284958