Diamond Files, Crystal Glass File Multi-purpose Diamond Coated Sharpener - 4-3/8 Long and Diamond Encrusted Filing Surface Crystal Saver, Crystal Repair. CRYSTAL FILE : The Crystal Saver is designed to smooth chipped or sharp edges on crystal, A little chip in your crystal is no reason to discard it. Repair it. GLASS FILE : A must have for every glass owner, and Repair your glass ware quickly and inexpensively. FLAT AND ROUNG SIDE : The file has a flat side and a rounded side for concave chips, and Smooths jagged edges and chips in no time. EASY TO CARRY : Easy to carry with a pen type clip for your pocket. SIZE : Product Size 4 3/8" long closed.