As a professional tennis racquet stringer this sprue cutter is perfect for my job. Racquet stringers need to cut a variety of string types, from hard polyester to soft nylon to natural gut. With sharp blades, you can easily cut threads of any type and thickness. I tried many different cutting tools before I found this one. Each had its own pros and cons, but I am very happy with this tool. It feels good in the hand, feels good in the hand and the small, sharp cutting head allows precise cuts in