The RAM-B-166-A-UN7U consists of a 3.3-inch diameter suction cup twist lock base, a short length double socket arm, and a universal spring-loaded X-Grip cradle for cell phones. The suction cup twist lock base is designed to have a strong hold on glass and non-porous plastic surfaces. The included X-Grip cradle features a clean and clever four-leg design that provides excellent holding power without hiding your phone behind foam pads and plastic. The spring-loaded X-Grip cradle expands and contracts, allowing for a perfect custom fit for your cell phone. The RAM X-Grip is the evolved cell phone cradle, perfectly complementing the modern sleek interior of today's vehicles.