Two folding built-in Auto Grip Systems safely lock the instruments in place. The upgraded AGS yoke is designed to accommodate more guitar neck sizes from 40 mm to 52 mm (1.57" to 2.05"), including classic, acoustic, electric, and bass guitars. The attached NINA (Narrow Instrument Neck Adjustment) is specially designed to increase the thickness of AGS arms to accommodate narrow neck instruments from a minimum of 28 mm (1.10"), such as 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 for travel.