New 10pc 4" (100mm) Mini Diamond Needle File Set = ceramics+tile+glass Works on all natural materials marble, wood, stone, bone etc. 4" (100mm) overall length; 1 1/2" (35mm) filing surface Soft PVC-dipped handles have excellent grip even when exposed to moisture and fluids Used in deburing,fixing chipped glass&tile,deling,many hobbies and professional applications Here's a set of (10) mini embedded-diamond files with round dipped handles. The file portions are 1mm and 2mm wide assorted pointed-round and blunt-flat tips.