TLC for your beloved instrument. The Dunlop Maintenance Tools Uni Wrench has a unique design with renowned quality that will last for years to come. You can adjust almost every single nut on your guitar or bass. Even the round nuts. This is possible thanks to Dunlops unique design that offers an exceptional grip – every time. So with precision-tooled teeth and a premium stainless steel design youve got one handy tool that belongs in every guitarists gig bag.