Quality diamond-tip bead reamer set includes hollow aluminum handle with brass chuck.Three points included:45% Edging Point - Smooths bead edges to reduce wear on string, cord, thread & wire; Small Reaming Point & Large Reaming Point - both reaming points can be used to straighten, smooth & enlarge holes in ceramic, glass, stone and other types of beads. Smallest point is .5mm, largest is 5.25mm.