The HERCULES Double Guitar Stand GS422B PLUS accommodates two instruments and features the foldable Auto Grip System (AGS) yokes, Instant Height Adjustment Clutch, Specially Formulated Foam (SFF) rubber contacts and the adjustable back rests. Two folding built-in Auto Grip Systems safely lock the instrument(s) 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 Rests with multi-angle position adjustment support the instrument securely and fold up securely for travel. [embed]https://www.youtube.com/watch v=pQWvlyWTwsQ&feature=emb_logo[/embed]