GEARWRENCH ratcheting tap and die I handle systems are perfect for the master mechanic or machine Shop. The set comes with blow molded case for safe and organized storage. A 5 degree ratcheting arc with reversible lever eliminates hand over hand turning. Twist Lock guide system reduces back walk of die guide extension adapters providing access in tight confined areas. The length of tap and die system can be extended by combining adapters and any 3/8 drive extension. Tap holders tilt down for easy access keeping taps secure and organized. The die adapter works with round and hex shaped dies. Tap and die sizes include 4-40 to 3/4 and 3 mm to 18 mm sizes.