1/8″-27 NPS Round Pipe Die, 1″ Outside Diameter – High Speed Steel – National Pipe Straight Review February 7, 2019 Kangaroodle No Comments Threading Dies Round, Split, Adjustable Dies. Besides use on pipes, National Pipe Straight threads are frequently found on lighting fixtures. Post navigation ← Robert Sorby H3688 – Cove Cutter for H0506 1/4 and 1/2 Inch ReviewAmartisan 12” long Screwdriver, Phillips Screwdriver PH2 Magnetic Screwdriver Long Blade Screwdriver 12-Inch (NEW) Review →