... bit 1.Dia:3 1/2''--26'' 2.Type:Milled tooth & TCI 3.IADC:116,217,437,517,537 ... shale,clay and salt bed,etcHardfaced gage and all tooth surfaces.0.25~0.70200~80TGA125125Soft with low, ... soft limestone and sandstone,etc.Hardfaced gage and all tooth surfaces.0.25~0.70200~80TGA214 TGA215214 215Medium ... compacts in inner row,spherical compacts in outer row.0.50~1.20200~401.Type:TCI -tungsten carbide insert ...