Chromium Alloy Steel Needle File Set, 6 pcs The #707476 Six-piece Chromium Alloy Steel Needle File Set is ideal for craftspersons, tool and die makers, hobbyists, watchmakers and jewelers. Features: All files are made of high-quality chromium alloy steel, with a #2 Single Cut Swiss pattern Precision locking screw chuck secures files in handle Tip types: Warding (flat), Square, Round, Half-round, Equalling (mill), Three square Length (each file): 5-1/2 in. Shank diameter: 1/8 in.