... shank size:2 7/8'' 3)sealing:metallic seal 4)processing:forging 5)MOQ:1pc Fitting1)6 1/2''2012 ... /2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, 24,26417 427 437517 527 ... 216 217 315 316 317 325 327PDC BIT(3 blades,4 blades,5 blades,6 blades)5 1/2, 6 1/27 7/8,8 ... 1/2,8 3/410 5/8,12 1/413 3/4 ... need more information,please feel free contact to me. 4 3/8''2012 oil well drilling bits prices