Bottom Bracket Socket Dub & BSA30 627621 Anodized RedAll models of bottom bracket sockets are precision CNC machined tools for installation and removal of different external bottom bracket cups. They are made of aluminum billet and anodized red for durable finish and precise fit, that wont damage aluminum external bottom bracket cups. 1 2 square drive makes it easy to use with torque wrenches, ratchets and fixed handles. New advanced technology The use of new technological methods and top quality