Diameter

No x Buttons diameter mm

Button

angle°

Air

holes

Weight

(Kg)

Part No

mm

inch

Gauge

Front

　 Drill bits for GBR2A hammers

76

3 9/16

6x13

5x10

38

2

3.6

GBR2-76BFF6

80

3 3/4

6X13

5X11

38

2

4.0

GBR2-80BFF6

90

3 15/16

6X14

5X12

38

2

4.2

GBR2-90BVC6