Actually 3 tools in 1. Use this tool to enlarge, de-burr, and round-out bead holes. Three different tips are included to fit bead holes from the smallest up to 5.0 mm. Each tip is coasted with diamond dust for smooth, even reaming. Tips store conveniently inside the tool and attach to the front for sue. Handy spring clip enables you to carry tool in your pocket like a pen. Bead reamer measures 4 1/2 in. in length. Large tapered tip measures 3 1/2 in., small tapered tip measures 2 in., and edging tip measures 1 3/4 in.