Silva Art. 027 bottom bracket T47 tapper complete with taps Art. 018 right hand thread and 019 left hand thread and facing/chamfering cutters Art. 041. Threading and facing/chamfering is performed on both sides of the B.B. shell in one operation. Taps and facing/chamfering cutters run on ball bearings to ensure precise operation. Cutters are of the highest quality high speed steel to ensure long cutting life.
