Drilling bits

Bit Shank Style

Bit Head Size Range (inch)

Face Design

FOR VALVED HAMMER

JCR 2'

2.5'-3'

Flat, convex, concave

JCR 3'

3.5'-5'

Flat, convex, concave

JCR HP 45

4.5'-5.5'

Flat, convex, concave

JCR D16

6'-8'

Flat, convex, concave

JCR D17

8'-11'

Flat, convex, concave

FOR VALVELESS HAMMER

JCR

4.75'-6'

Flat, convex, concave

Jet 55

5.5'-8'

Flat, convex, concave

Sj 60

6'-7.5'

Flat, convex, concave

Sj 65

6.5'-7.5'

Flat, convex, concave

Sj 70

7.5'-8'

Flat, convex, concave

Sj 80

8'-14'

Flat, convex, concave

Jet 100

10'-14' and 16'

Flat, convex, concave