Use the Beadalon Very Fine Pearl Reamer to enlarge and smooth out drill holes in pearls. The sharp, corkscrew-like file fits easily into the hole of any small pearl. Simply slide a pearl onto the file, and slide the pearl back and forth until desired interior diameter is reached. You will notice pearl dust as it cuts. Drill diameter: 0.6 mm (.024") 5 inches (12.7 cm). Made in USA.Details:9.25" x 1.85" x 0.5" package size0.6 mm drill diameter5" tool length