Unlike ordinary mechanical turners, the Pro-Winder is patented and features a string cutter, bridge screw tool and string tensioner. The Pro-Winder is designed to fit all guitars, banjos and mandolins. Ergonomic and durable with its reinforced steel string cutter, the Pro-Winder is the ultimate all-in-one tool for string replacement. A must-have in every case! Also available in a bass version. D'Addario is renowned for its innovative, high-quality musical instrument accessories, which have the ability to solve the problems encountered by musicians through a comprehensive range of cables, picks, tuners, capodasters, straps, humidifiers, maintenance tools and much more.