Filing the ends of wire is as simple as pressing a button! Use with the Battery Operated Bead Reamer (purchase separately - see tools section) to quickly and easily round the ends of wire-wrapping wires like Silver-Filled and German Style Wires as well as Artistic Wire. The Wire Rounders can also be used with fine metal wires. Use the Wire Rounders to file handmade earwires and finish the ends of wire wrapped designs for an ultra smooth finish with no sharp edges. The smallest tip will round wires of 20 gauge and smaller; the medium tip works with 16 and 18 gauge wire; and the largest tip smooths 12 and 14 gauge wires.