Efficient Help: Clean up old, broken and damaged threads with the hi-spec tap and die set; The taps cut the internal threads and the dies cut the external thread with their fine threads; Using these steel taps and dies with cutting oils is the fastest and most efficient way to add screw thread to a workpiece Excellent Performance: Fully ground, high precision tap is ultra-sharp for your tapping and chip removal operations, operating smoothly and efficiently, taps and dies yield giving you excellent performance Easy to use : When using professional taps and dies for tapping operations, insert the taper first so that the centerline of the tap is consistent with the centerline of the hole; rotate both hands evenly and apply light pressure to advance the tap; each time the tap of tools is turned, high hardness taps and dies reverse about 45 to cut chips to prevent clogging Must-Have Tools For Craftsmen: Round die taps tool is ideal for screwing fasteners and fixing holes, Metric parts tap set is for auto and mechanical repair; Perfect set for the professional and amateur craftsman; Known for their ability to be used easily, these taps and dies are the most commonly used style and are perfect for most hand threading applications Widely Applicable Taps And Dies: These high quality taps and dies can thread through any metal with effective results; Solid metals that can be tapped or threaded include aluminum, brass, carbon alloy steel, cast iron, and bronze; This hardened thread set is relatively easy to use, offering less fatigue and has high resistance to corrosion and wear