QUADVERSAL QUICK-OPENING, fully adjustable with built-in blade type Reamer and quick open-close Die Adjustment LEVER. Handles all American Standard pipe threads within its range simply by changing and adjusting dies. (Threads 1” thru 2” pipe without die change). Bolt threads require change for each size and pitch, right-hand only. QUADVERSAL Oster Dieheads use Symbol QUAD Oster Dies.