12 Piece Precision Needle File Set, Shank Cone Machine Diamond Files for Reciprocating Grinding, 150/200/300/400 Grit USEFUL TOOL: The needle needle assembly helps to improve work efficiency and reduce labor intensity. EASY TO USE: Needle files are easy to use, safe and reliable, easy to take. USED FOR: Ideal for floating edge, milling cutter, welding repair of casting, forging, welding parts; chamfering and groove processing of various mechanical parts; cleaning inner holes of pipes, finishing parts, etc. DURABLE : High quality metal process for long life.SUIT FOR: The needle file set is applicable to the processing and repair of moulds, hard alloys, glass instruments, jade; stone carving, engraving, cutting lines, grinding, hollowing out; jade, glass and other carvings . Note: The data are all manual measurement, please allow 1-20cm error, due to the light and display difference, there will be some color difference, depending the received physical object.