20pcs Set Hand Tools Metric Thread Tap Die Alloy Steel Adjustable Tap Wrench

The milled ends of the adjustable tap and die wrench handles enable a slip-free grip for demanding jobs. The wrench handles securely hold the tap and die pieces. 'Tap' is used to cut or form a thread on the inside surface of a hole creating effectively a nut, whilst a 'die' is used to cut or form matching bolts.