Guitar or Bass Hanger, Plexi AGS structure with polycarbonate reinforcement reinforces maximum pressure resistance and break resistant performance, fits most neck sizes from 40 mm to 52 mm (1.57 "- 2.05"), the NINA (HA301 Narrow Instrument Neck Adjustment) attachment is specially designed to increase the thickness of AGS arms to accommodate narrow neck instruments from a minimum of 28mm (1.10”) such as banjos and mandolins, standard bolt-on wall mounting system, length arm length: 105 mm (4.1”), load capacity: 7 kg.