The upgraded Hercules GSP38WB PLUS short arm wood base guitar wall hanger features auto-swivel yoke that rotates automatically to accommodate different-shaped guitars or basses vertically and safely. The GSP38WB PLUS features an attractive wood base for home or studio use. It also includes the NINA (Narrow Instrument Neck Adjustment) accessory, which adapts the GSP38WB PLUS to fit narrow necks, such as a ukulele, banjo or mandolin.