BeadSmith Round Your Wire Tool for Smoothing Wire Ends with a 1.8mm Cup Bur. (A cup bur is a very small, cup-shaped file which works perfectly on the ends of wire to smooth sharp ends.) Designed for soft wire such as sterling silver, copper or gold-filled wires. To use this tool:
- Insert cut wire into the cup.
- While pressing the wire into the cup, twist the wooden handle back and forth.
- Stop twisting occasionally to look at the wire end. Continue to twist until the end is smooth and rounded.