Jewelry Tool Diamond Bead Pearl Reamer 4pc Set Beading Hole Reamers Dbr2 Approx 4" total lengths 4 Reamers include entire range of sizes from: 0.5mm to 5.5mm Used to File, Enlarge, and Remove unwanted Burr from Bead Holes Can be used on Glass, Plastic, Metal, Wood beads, etc... Diamond Dust coated