... :1pc Fitting1)6 1/2''2012 Hot oil rig drill bit 2) tungsten carbide3)Medium hard with high compressive strength and hard stringers,such ... .ProductSizeIADC CODE TCI Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 ... 637 737Steel Tooth Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 ... BIT(3 blades,4 blades,5 blades,6 blades)5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8 ...