they  cut from internal of pipe, marine casing cutteris suitable for big diameter pipe, and mechanical casing cutter is suitable forsmall diameter pipe.

Wespecialize in manufacturing all kinds of drilling stabilizers, hydraulicadjustable stabilizer, roller reamer, non-magnetic drilling stabilizers, specialstabilizer with reamer and back reamer, hole opener, under reamer, Square Kelly,hexagonal Kelly, drill pipe, spiral heavy weight drill pipe, heavy weight drillpipe, spiral drill collar, standard drill collar, non-magnetic drill collar,spiral non-magnetic drill collar, series of drilling jars (mechanical drillingjar, hydraulic drilling jars, double acting drilling jar, , fishing jars (bumper sub, surface jar, jar intensifier),IBOP for top drive(VARCO), fishing tools (fishing overshot,fishing spear, junk basket, fishing magnet, ditch magnet, junk sub, taper tap,die collar, internal hook, external hook) , mechanical/hydraulic internal/externalcutters, all kinds of junk mills (flat bottom junk mill, concave bottom junkmill, skirted junk mill, pilot mill, tapered mill, bladed junk mill, watermelonmill, economill), washover tools, core tools, drill bits, float collar, floatshoes, stab-in float collar, stab-in float collar and shoes,floatation collar, reamershoe, guide shoe, casing scraper, key seat wiper, Kelly valve, full openingsafety valve, drop-in check valve, arrow back pressure valve, inside bop, floatvalve sub, by-pass valve, cup tester, oriented bent sub, wear sub, circulatingsub, reduce sub, lifting sub, saver sub, oriented sub, multicycle circulatingsub, high speed bypass valve, impression block, safety joint, mud bucket,wiper, Kelly bushing, casing,tubing, casing running tool, drill rig package.