The Diamond Tip Bead Reamer is used to smooth bead edges to reduce wear on string, cord, thread and wire (45º Edging Point) and to smooth and enlarge holes in ceramic, glass, stone and other types of beads (Small and Large Reaming Point). The Diamond Tip Bead Reamer features a sturdy Hollow Aluminum Handle to allow store of tips, a brass chuck, and 3 different size diamond tips with the smallest point 0.5mm and largest 5.25mm. Tip: As with any reamers, be sure to apply only slow, gentle pressure to avoid breaking or chipping your beads