1.high and low air pressure down-the-hole drill bits 2.Low air pressure holeDia.:65-220mm 3.High air pressure hole Dia.:85-305mm 4.Face type: drop center bit/concave face/convex face/double gauge face/flat face bit 5. Carbide button shape: domed/round button parabolic/semi-ballistic button ballistic button sharp button flat button 6. Drill rock type: Granite, Marble, Limestone, Basalt, ect. 7. Project types: Blast holes, Quarry , Anchoring, Infrastructure, Geothermal holes, Well drilling,ect.
