... 26" 3.Material:Carbon Steel 4.Competitive price Type:Drill Bit Description of the 8 3/8" Kingdream TCI ... and high drillability such as shale, clay, soft limestone, rock salt, gypsum,etcPayment termsL/C, T/T, Western ... new type of grease, which can stand high temperature up to 250 centigrade and with low abrasive wear. Applicable ... 8 3/8" Kingdream HA 447G TCI Tricone rock drill bit/three cone bit