To easily enlarge holes in pearls, gemstone, or other beads, submerge bead and tip into a small amount of water, firmly hold bead and press the button and watch the reamer work. Includes two reamer tips which measure 5cm and taper from approximately 2.0mm at the base to 0.5mm at the tip. Replacement tips are also available. Tool measures 5.25 inches (13.3 cm). Retail-ready packaged. Requires 2 AA batteries (not included).