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. 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. Each measures approximately 5 1/2" (140 mm) longWe work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.