Made from rugged, high-tensile, anodized aluminum with stainless steel hardware. Saltwater spray tested and UV stable; to help endure harsh marine environments. Standard bolt hole pattern allows for mounting on top of the pedestal and beneath any individual seat. Features a heavy duty forward hinge system allowing shock absorption to occur in the vertical plane only, eliminating sway and side tipping. Perfect for mounting beneath a seat greater than 20″. Includes provisions for mounting seats with a 6″ center hole pattern. The outline is 13″ x 7″ with standard 5″ x 12-1/8″ slotted mounting hole pattern.