BOTTOM BRACKET PEDROS PRO SOCKET CUP SET 5pc w/SOCKET CUP/INSERT SHI-16x44/BSA30/DUB-12x46/T47-16x52/12x52Magnetic plug and play system replaces four BB sockets. Included Pro BB Socket Cup and four Pro BB Inserts pack down to the size of one traditional BB socket tool 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 Holder 7075 T6 aluminum socket is fully machined to precise tolerances for an exacting