For installation of devices on pipes and stays; carts, stands, wheelchairs, etc. Mounting plate sized 50 x 42mm with pre-drilled holes. Attaches securely to round handlebars or any round pipe. The face plate accommodates all ProClip device holders and other device holders with the AMPS hole pattern. Smallest diameter pipe or bar – 29mm (1 5/32 inch). Largest diameter pipe or bar – 40mm (1 9/16 inch)