Taps and dies are tools used to process threads. The tap is used to process internal threads, and the die is used for external processes 5pcs Screw Tap: M6 x 1.0, M7 x 1.0, M8 x 1.25, M10 x 1.5, M12 x 1.75 5pcs Screw Die: M6 x 1.0, M7 x 1.0, M8 x 1.25, M10 x 1.5, M12 x 1.75 1pc Tap Wrench: M3-M12 1pc Die Wrench: 25mm TAPPING & CUTTING: Start tapping easily, either cutting new material or driving out slightly damaged threads, e.g. old screws, spark plugs, rusty nuts and bolts with the tap and die set. Simple hand tapping, threading, and chasing with clean results at home, in the garage, or in the workshop THREADING / FORMING AND PINCHING: Clean up old, broken, and damaged threads with the Hi-Spec tap and die set. The taps cut internal threads, and the dies cut external threads with their fine threads. Using these cutting tools with cutting oils is the fastest and most efficient way to add a screw thread to a workpiece METALS: A high-carbon chrome bearing steel with high resistance to