Suitable for Shale, Lime stone, Sandstone, Gravel Soft formations with compressive strengths of 50 to 110 Mpa.
Large diameter and widely spaced chisel or sharp conical carbide inserts with high projection. Small flat inserts placed in between, on gage and inner rows to prevent cone shell erosion. Hard faced cone shell to delay erosion and exposure of active inserts.
Suitable for Granite, Marble, Hard Sandstone Medium Hard formations with Compressive Strengths of 90 to 150 Mpa.
Moderately spaced conical inserts with medium projection. Doublerow gage protection inserts. Hard metal deposit on nose area to protect against cone shell erosion.
Suitable for Dolomite, Granodiorite, Quartzite, Magnetite, Banded Hematite Quartzite. Formation of 150 to 250 Mpa. and banded iron and abrasive consolidated formations with compressive strengths of above 200 Mpa.
Closely spaced conical or spherical Inserts with medium to low projection. Hard metal deposit on nose area to protect against cone shell erosion.