... 4)processing:forging 5)MOQ:1pc Fitting1)6 1/2''2012 Hot oil rig drill bit 2) tungsten carbide3)Medium hard with high ... TCI Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1 ... Tooth Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1 ... (3 blades,4 blades,5 blades,6 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 ...