... 2)pin shank size:2 7/8'' 3)sealing:metallic seal 4)processing:forging 5)MOQ:1pc Fitting1) ... 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, ... 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, ... 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, ... ,please feel free contact to me. 4 3/8''2012 oil well drilling bits prices