UNIVERSAL QUICK-OPENING, fully adjustable with built-in blade type Reamer and quick open-close Die Adjustment LEVER. The best diehead available that will handle the full range of both RIGHT- and LEFT-Hand Pipe and Bolt threads! Each set of Oster pipe dies will thread two sizes (except 1/8”). Oster bolt dies are one set to a size. UNIVERSAL Oster Dieheads use Symbol 300 Dies.