Irwin Tools 1835091 Performance Threading System Tap and Die Set -Machine Screw/Fractional, 40-Piece This product is made of high quality material This is easy to install and easy to use This product is manufactured in USA Contains SAE Plug Taps and Dies with Drive Tool System All Taps and Dies are constructed of High Carbon Steel Laser Etched Markings for easy identification Die lock ergonomic die handle that also accepts two different adjustable tap sockets