1)6 1/2''2012 Hot oil rig drill bit 2)pin shank size:3 1/2'' ... seal 4)processing:forging 5)MOQ:1pc Fitting1)6 1/2''2012 Hot oil rig drill bit 2) tungsten carbide3)Medium hard ... CODE TCI Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 ... 327PDC BIT(3 blades,4 blades,5 blades,6 blades)5 1/2, 6 1/27 7/8,8 1/2, ... you need more information,please feel free contact to me. 6 1/2''2012 Hot oil rig drill bit