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HDD 80 Directional Hammer
Hole Size: 9.75 to 10" (248mm to 254mm)
Hammer Outside Diameter: 7.75 (197mm)
Bit Shank: HDD 80
Connection Size: 4 1/2 API Reg Pin
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HDD 60 Directional Hammer
Hole Size: 7 to 7.50" (178mm to 191mm)
Hammer Outside Diameter: 5.75 (146mm)
Bit Shank: HDD 60
Connection Size: 3 1/2 API Reg Pin
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HDD 50 Directional Hammer
Hole Size: 5.75 to 6.125" (146mm to 156mm)
Hammer Outside Diameter: 5 (127mm)
Bit Shank: HDD 50
Connection Size: 3.5 API REG PIN
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HDD 40 Directional Hammer
Hole Size: 4.75 to 5" (121mm to 127mm)
Hammer Outside Diameter: 3.875 (98mm)
Bit Shank: HDD 40
Connection Size: 2.375 API REG PIN
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HDD 35 Directional Hammer
Hole Size: 3.875 to 4" (98mm to 102mm)
Hammer Outside Diameter: 3.25 (83mm)
Bit Shank: HDD 35
Connection Size: 2.375 API REG PIN
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