Sturdy and Durable: 45 steel taps and alloy steel dies have good hardness, strong strength, and long service life. Adjustable: The tap wrench is adjustable to fit different taps and can hold the tap firmly and securely. With Thread Pitch Gauge: This set also includes a thread pitch gauge that you can use to check the created thread. Marked Size: All taps and dies are clearly marked with the size for easy and quick finding.