Pro-Winder Guitar String Winder and Cutter. The ultimate restringing tool, resized for bass guitar tuning keys. Unlike ordinary peg winders, the patented Pro-Winder is a high-quality peg winder with a built-in clipper built extra-strong to cut through bass strings with ease. Ergonomically designed with hardened tool steel wire cutters, the Pro-Winder with built-in clipper is the all-in-one bass restringing tool, and it comes with an unconditional guarantee.