Keep your optic close and ready for use when opportunities present themselves with the bino gear Bino Dock Roof Prism Binocular Holder. Built of tough and durable ABS plastic, the holder will accept models with objectives of up to 56mm and the included insert simply fits into cup holders on cars, trucks, ATVs, quads, side-by-sides, RVs, and many other vehicles. The holder can slide sideways on the cup holder insert so you can adjust its placement to avoid interfering with other cup holders or gear shifts. If your holder is too big for the insert, you can use one or all of the three rubber spacer bands to snug up the fit so the Bino Dock won't bounce out on pockmarked back roads or rough and pitching waters, and to keep your bino from bouncing out there is an adjustable rubber strap that holds it securely in the holder. For those who may want to mount the holder on a wall or deck, you can remove the cupholder insert and install just the holder on screws that you provide using the two pre-drilled mounting holes. The Bino Dock is designed for roof prism models only; Porro prism models will not fit.