... processing:forging 4)sealing:metallic seal 5)MOQ:1pc Fitting1)7 7/8'' API speed droll bit2) tungsten carbide3)Medium hard ... Ltd.ProductSizeIADC CODE TCI Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/ ... 537617 637 737Steel Tooth Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3 ... blades,6 blades)5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 ... more information,please feel free contact to me. 7 7/8''API diamond drill bit