CLEAN, ACCURATE CUTS: Be ready to tap and thread in your garage or workshop with the Master Your Job Kit: Internal/External Rethreading, Cutting New Materials, Repairing Rusted Screws, Nuts, Bolts, and Spark Plugs. The 40 complementary pieces provide maximum versatility. EXTENSIVE RANGE OF METRIC SIZES: Includes common coarse and fine thread sizes, three- and four-stud, tapered, and plug tap and die pitches. Includes 8 thread sizes M3 to M12 with 16 NPT (1/8-27) pitches to meet all your needs. GCR15 ALLOY STEEL FOR METALS: Perfect for carbon alloy steels, cast iron, aluminum, brass, and bronze. GCr15 steel ensures high Rockwell hardness, excellent contact fatigue resistance and superior corrosion resistance. 3 TAP AND DIE WRENCH HANDLES: Use the alloy steel wrench handles with adjustable fittings to secure and manipulate taps and dies. The kit also includes a handy mini screwdriver to assemble and secure dies with ease. ACCURATE SCREW PITCH GAUGE: Quickly and accurately measure the pitch or feed of a screw thread with the included 16-blade screw thread gauge. All tools and accessories are neatly stored and organized in a compact case for easy storage and transportation.