The Micro 100 Threading Tool Set includes 3 high speed steel threading tools with 1/4" shank diameter. The set includes a 60 degree internal threading tool, a 60 degree external threading tool, and a 55 degree external threading tool. The tools have TiN coating for wear resistance and lubricity. They are made in the USA and can thread a variety of materials including steel, stainless steel, cast iron, aluminum, plastic, and more. The tools have a ground thread relief to prevent binding.