Specification:M3 M5 M6 M7 M8 M9 M10 M12 M13 M14 M16 M18 M20 (M1-M6 are point head, M7-M20 are flat head).
Main Features: Processing cast iron, manganese steel, quenched and tempered material, medium thickness stainless steel.This is machine taps (suitable for bench drills, tapping machines, electric drills).Both machine and hand can be used.