Irwin Tools 1841350 Performance Threading System Self-Aligning Tap and Die Set, 75-Piece Contains SAE Self-Aligning Taps, Metric Self-Aligning Taps, SAE Self-Aligning Dies, Metric Self-Aligning Dies and 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