Beadalon-Battery Operated Bead Reamer Wire Rounder Tip 20 Gauge. Now filing the ends of wire is as simple as pressing a button! Use this bead reamer to quickly and easily round the ends of wire- wrapping wires. Use to file handmade earwires and finish the ends of wire-wrapped designs for an ultra smooth finish. This 4-1/2x1- 7/8 inch package contains one bead reamer for 16-18 gauge wires. Imported.