The RAM® Tough-Mag™ 48MM 4-Point Magnetic Mounting Base (RAM-MAG48-4SU) consists of an aluminum plate with four magnetic ends and four 48mm external magnets for mounting any flat glass surface, like windows. The plate contains pre-drilled 4-hole AMPS and VESA patterns for attaching a recommended C, or D size drill-down ball base. The base is designed with rubber coated magnets to prevent scratching the mounting surface and reduce the impact of the jarring magnetic pull. Each external magnet includes a handle in order to easily install the base to a window. Compatible with any sturdy, flat surface up to 6mm in thickness.