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12°H22/H25*108mm taper rod 400-6000mm
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R28 Thread button bit 38/41/43/45/51mm standard/retract

R25 Thread button bit 33/38/41/43/45mm standard/retract

R25 is the most widely used drill bit for underground drifting. It is made of alloy steel and carbide , has wear resistance and corrosion resistance. Different button shapes are used in different rock formation structures, including excavation, hole expansion, etc. Different shaped head structures,

Thread: R25

Diameter: 33-45mm

Head shape: flat face

Body:Retract/standard

button:l,ballistic ,pike

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R28 is the most widely used drill bit for underground drifting. It is made of alloy steel and carbide , has wear resistance and corrosion resistance. Different button shapes are used in different rock formation structures, including excavation, hole expansion, etc. Different shaped head structures, Thread: R28 Diameter: 38-51mm Head shape: flat face Body:Retract/standard button:l,ballistic ,pike
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