This 4in1tool is made from high quality Japanese Steel. This exceptionally fine tool is extremely sharp it cuts perfectly and easily any monofilament up to 100lb keeping it's sharpness. The needle is so sharp it will clean hook eyes as well as straighten wings, hackles, wind knots, picking, dubbing where ever sharp good quality needle is need it. Knot tying tool that makes knot tying so easy. Including also a handy small whetstone for hook sharpening. Super handy tool which has it all.