Four tools in one! Enlarge, de-burr, or round out bead holes. Four different tips are included, fitting bead holes from the smallest up to 5.0mm. Each tip is coated with diamond dust for smooth, even reaming. Tips store conveniently inside the tool and attach to the top for use. Handy spring clip makes it easy to carry. Replacement tips sold separately. 4.5 inches (11.4cm).