"Sometimes the hole in a bead or pearl is too small, is not straight, or the two holes in some hand-drilled beads may not quite meet. This simple diamond tipped bead reamer is the perfect tool set to quickly solves all those problems. This four piece set has all the shapes and widths you'll ever need. Steel tools encrusted with industrial grade diamond are used to hand grind bead holes larger, and take out unwanted burrs from bead holes before stringing."