B& S Metal Gauge

Ideal Blade Size

Drill Bit #

26 (0.4 mm)

8/0

80

24-26 (0.5-0.4 mm)

7/0, 6/0

80, 79

22-24 (0.6-0.5 mm)

5/0

78

22 (0.6 mm)

3/0

76

20-22 (0.8-0.6 mm)

2/0, 1/0

75, 73

18-20 (1.0-0.8 mm)

1/0, 2/0

71, 70

16-18 (1.3-1.0 mm)

3,4

68, 67

14-16 (1.6-1.3 mm)

5

65

12-16 (2.1-1.3 mm)

6

58

12-14 (2.1-1.6 mm)

7

57

12 (2.1 mm)

8

55