... Hot oil rig drill bit 2)pin shank size:3 1/2'' 3)sealing:metallic seal 4)processing:forging 5)MOQ:1pc Fitting1) ... 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, 24,26417 427 437517 ... /27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, 24,26115 116 117 ... /27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, 24,26M223,M322,M316 ...