The Diamond Bead Reamer with 4 interchangable Tips are intended for use on glass, ceramic or stone beads. Perfect for softening rough edges to prevent them from cutting into thread (tips A and B), and ideal for opening and enlarging bead holes (tips C and D) The Diamond Bead Reamer features a sturdy Wooden Handle and 4 interchangable diamond grit tips, to ensure you have the right tip for the right bead. It is ideal for softening rough edges of beads and to smooth or enlarge bead holes and a storage tube for bits. Please note: Always take proper precautions and wear a face mask when using.