The Hercules GSP38WB Plus rotates automatically to accommodate different shaped guitars or basses vertically and safely. It features the wood base with black finish for home or studio use.The Auto-Swivel AGS Yoke allows for multi-angle adjustments while safely locking instrument in place. It can accommodate a wider range of instrument neck sizes from 40 mm52 mm (1.572.05) including classic, acoustic, electric and bass guitars.The attached N.I.N.A. (Narrow Instrument Neck Adjustment, HA301) are specially designed to increase the thickness of AGS arms to accommodate narrow neck instruments from min. 28 mm (1.10) like banjos and mandolins.Attractive wood base with black finish.