冲头                      孔径
A19 (3 / 4)         19.8 mm
A25 (1)              26.1 mm
A31 (1 1/ 4)       32.5 mm
A39 (1 1/ 2)       38.7 mm
A51 (2)              51.6 mm

B16 (1/ 2)          21.8 mm
B22 (3 / 4)         27.6 mm
B28 (1)              34.1 mm
B36 (1 1/ 4)       42.7 mm
B42 (1 1/ 2)       48.7 mm
B54 (2)              60.5 mm