Shakespeare 4722 light duty antenna mounts are made of ultra-violet (UV) resistant ABS plastic to resist fading and discoloration from prolonged exposure to sunlight. Mounts attach to 7/8 and 1 inch horizontal railings and feature a side slot for coaxial cable to slide through when mounting the antenna. The cable slides out the bottom of the mount for a clean install. Use to rail mount smaller antennas, and on smaller vessels with railings.