The RAP-SB-224-2-UN7 consists of a snap link, 2.75" diameter twist lock suction cup base and 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, including adhesive disks. The spring loaded X-Grip® cradle expands and contracts, allowing for a perfect custom fit of your cell phone. Combine RAM single socket technology for adjustment and the holding power of a twist lock suction cup and you've got a mount ready for the road and whatever vehicle you want to drive today.