Description:  This is a multi use diamond file.  Originally used for sharpening knives and tools, this file can be used for filing glass, metal, stone, and ceramic.  It's half round design is similar to traditional jeweler's half round files so you can use it on rings and all other jewelry type projects.  If you are interested in it's sharpening ability it can be used on all types of knives as well as serrated knives.  Overall this is an excellently designed tool.  The file has an approximately a 600 grit diamond grit.
 
Approximate Size:  10" overall length, 6" long x 1" to 1/8" tapered width
Material:  Diamond coated steel, hardwood handle
 
Made In China