Side Mount Heavy Duty Polished Rd Holders. SIDE MOUNT CAST BASE 27? ROD HOLDER An all aluminium Rod Holder specifically designed for gunwale mounting on narrow deck boats. Predominantly used around the Transom area for rods, bait board spigots, barbecues etc. The mount is cast marine grade aluminium, welded to extruded tube. The mount includes a drilled lug for the attachment of a safety clip for tackle.