This mount combines the versatility of Magma's popular "LeveLock" all-angle quick release, cam-action mount for instantanious leveling, with a sturdy, vertical over-the-water round rail mount. The mount is made entirely of 18-9 stainless steel and 356 hard anodized aluminum to outlast even the most severe marine environment. Quickly disassembles for storage without tools, leaving no hardware on the rail. Designed for use on 7/8" or 1" round railings.