Magnetic plug and play system replaces multiple BB sockets - buy a single cup and pair with the inserts you need (sold separately)Features a 3/8` square drive for use with torque wrenches, a 24mm external drive for use with Pedro`s Pro Socket Handle and pedal wrenches, and internal M12 thread for use with the Pro BB Socket HolderPair the Pro BB Socket Cup with Pro BB Inserts, sold separately, to adapt to numerous types of threaded bottom brackets, disc lockrings, and more7075 T6 aluminum socket is fully machined to precise tolerances for an exacting professional-level fitExternal BB SocketGold64607603/8`UPC/EAN/GTIN: 790983298739