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. These diamond-tipped reamers are intended for use on glass, ceramic or stone beads. These Steel tools are encrusted with industrial grade diamonds and the red and yellow handled reamers are ideal for opening and enlarging bead holes, the green and blue are perfect for softening rough edges to prevent them form cutting into threads. Please note: Always take proper precautions and wear a face mask when using.