Includes:

2 bottom bracket cups:  51.54mm (2") OD side inserts into frame

Inner threaded area 1.37" x  24T
4 long screws to secure crank cups

Application:

Recieves our bearing set 503016 + 503018 136mm extra wide spindle or a standard cartridge
Heavy duty design for motorized bicycles.

Entire bottom bracket kit is available too, see 503405