... forging 5)MOQ:1pc Fitting1)6 1/2''2012 Hot oil rig drill bit 2) tungsten carbide3)Medium hard with ... 8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, ... 24,26417 427 437517 527 537617 637 737Steel Tooth Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2 ... ,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, ... blades)5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, 24 ...