UNIFIBER HD RDM ALUMINIUM MAST EXTENSION (U-PIN)Designed to survive under heavy loads, HD RDM extensions are best suited for high performance racers and wave riders. Rigid and sturdy, all parts of the extension are toughened to give a piece of mind even in the gnarliest situations. The main tube is manufactured from hardened T6 aluminium and the nylon base is fiber reinforced. The connection between both parts is fortified using a stainless steel insert. Pulley cleat system orientation makes