- 1.370″ x 24 TPI right hand tap – English adjustable cup (part #691)
- 1.370″ x 24 TPI left hand tap – English fixed cup (part #692)
- 45mm facing cutter (part #690)
The BTS-1 is a precision tool system which provides a piloted means of tapping the threads in the bottom bracket shell of a frame. After tapping, the taps act as guides to keep the included facing cutter perfectly square with the axis of the bottom bracket for cleanup of the faces of the bottom bracket shell.