10 Diamond Coated Needle Files Great for Filing & Cutting This is a new set of 10 assorted diamond coated needle files Great for filing glass, ceramic, rock, carbide, gold, platinum, silver or anything else that is hard They are 120 grit Great for cutting stone, gold and silver Made of tempered stainless steel Cut quickly and smoothly since the files cut on both the push and pull strokes These have fine grit diamond electroplated onto high grade stainless steel Each measures approximately 4" (102 mm) long Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.