Complete M3 To M12 Hi-Spec 39 Pc. Metric Tap And Die Set CLEAN CUT RESULTS: Start DIY garage and workshop tapping and threading with the Hi-Spec 39 Piece Metric Tap and Die Tool Set. Whether its internal or external rethreading, cut new material, chase damaged or old screws, repair rusty nuts, bolts and spark plugs 34 PIECE METRIC SIZES: Most popularly used coarse and fine thread sizes and pitches of three and four flute tapered and plugged taps and dies. Metric Tap and Dies: 8 thread sizes from M3 to M12 with 16 pitch sizes plus NPT (1/8-27) GOES THROUGH METALS: For materials such as carbon alloy steels, cast iron, aluminium, brass and bronze. Using premium GCr15 Alloy steel, a high carbon chromium bearing steel with high Rockwell hardness, contact fatigue performance, and corrosion resistance 3 TAP DIE WRENCH HANDLES: Just fix the tap or dies tools into the steel alloy wrench handles with adjustable fittings and get turning. Includes a handy mini-screwdriver to assemble and fix the dies SCREW PITCH GAUGE: Easily and accurately measure the pitch or lead of a screw thread with the 16-Blade Screw Pitch Gauge. All tools and accessories are kept tidy and organised in a slimline case for simple storage and carry