The On-Stage Stands MSA7011 U-mount Clamp-On Bookplate is a versatile accessory designed specifically for holding sheet music in place while playing or conducting. With a height of 2.250 inches and a width of 9.600 inches, this bookplate is suitable for securely attaching pieces of sheet music to music stands or lecterns for easy viewing and navigation during performances or rehearsals. The clamp-on design allows for easy installation and removal, providing a convenient solution for musicians and conductors who need to keep their sheet music in view during performances.