Magma Square/Flat or Side Bulkhead Rail Mount HD Dual. Also mounts to square or flat rails. Fits HORIZONTAL RAILS up to 2-1/4" (57 mm) high by any depth or VERTICAL RAILS up to 1- 5/8" (41 mm) wide by any depth. Rod portion of mount quickly disconnects for easy storage. Some fasteners required for installation. Specifications for Magma Dual Square/Flat or Side Bulkhead Rail Mount HD: Manufacturer: Magma Color: Black Package Contents: Magma Dual Square/Flat or Side Bulkhead Rail Mount HD Magma T10-540: Square/Flat or Side Bulkhead Rail Mount HD Dual