1.Ideal for rethreading fasteners and fastener holes for auto and machinery repair. 2.Precision milled sae tap and die set for cutting raw material or repair existing threads, remove screws and more function. 3.It can improve the efficiency of processing thread, a necessary tool for hand tapping operation. 4.High Helix Spiral Flute Designed to tap close to the bottom of blind holes in soft materials, these tools cut freely and allow adequate coolant to reach the cutting surfaces. 5.Regular helical fluted taps are recommended when tapping ductile stringy materials, aluminum and some stainless steels.