The Hercules GSP39WB wall hanger features an AutoSwivel yoke which allows different shaped guitars and basses to hang vertically. It's a universal hanger and can accommodate narrow necks as little as 28 mm wide to wider necks up to 54 mm. This makes it ideal for banjos, classical guitars, even 5 and 6 string basses. The instrument touching areas are covered in Hercules' unique SFF (Specially Formulated Foam) to protect your instruments