1.1.Dia:3 1/2''--26'' 2.Type:Milled tooth & TCI 3.IADC:116,517,537,617 4 ... well drilling 5.ISO,SGS approve Rock Bit1.Type:TCI -tungsten carbide insert and Milled tooth2.Available size: 85.5MM,88 ... in execlPls see other details:Available IADC code of rock bits Milled tooth:116,117,126,127,136,137,216,217 ... ,637,737.Contact:Rita FengPhone:86-18730702717 water well Rock Bit for hard formation size 8 1/2''