... barrel assembly, inner tube head assembly, over shot, hoist plugs, drill rod, casing pipe etc. With ISO certificate & quality control. ... what your requirements are. Size Available: "Q" Series: AQ, BQ, NQ, HQ, PQ (Front end & Back end Type) T Series: T36 ... & Casing pipe wrench Core barrel assembly & inner tube head assembly Drill rods & Casing pipes ( function(){ var aBigImageSrc = [ 'http://i01.i ...