... 2.Size range from 3 3/4" to 26" 3.Material:Carbon Steel 4.Competitive price Type:Drill Bit ... Seal Sliding BearingTypeDrill BitAPI Regular Pin(inch)4 1/2 Cutting StructureCone shape compact in inner row, wedge compact ... and high drillability such as shale, clay, soft limestone, rock salt, gypsum,etcPayment termsL/C, T/T, Western UnionMOQ1 ... 8 3/8" Kingdream HA 447G TCI Tricone rock drill bit/three cone ...