The Hercules Guitar Stand GS412B PLUS features the Auto Grip System (AGS) yoke, Instant Height Adjustment Clutch, Specially Formulated Foam (SFF) rubber contacts and the adjustable back rest. The built-in Auto Grip System safely locks the instrument in place. The AGS yoke is designed to accommodate more guitar neck sizes from 40 mm – 52 mm (1.57” - 2.05”) 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. The Instant Height Adjustment Clutch with Locking Pin adjusts stand height quickly, easily and securely. The Folding Back Rest with multi-angle position adjustment supports the instrument securely and folds up securely for travel.