Duratruss PRO Selflock Clamp 500kg Stainless A4 Black; Clamp designed for use in marine environments on cruise ships, in shipyards, beach clubs, indoor swimming pools or anywhere where marine grade A4 stainless steel is required. For truss tubes with a diameter of 48-51mm; Material: Upper & lower clamp parts: Aluminium 6081; Screws, washer, nut, butterfly, threaded rod and spring pin made of A4 stainless steel (type 316, 18/10 rustproof); Device screw: M12 x 40mm; Colour: Black; Max. load/SWL: 500kg; Dimensions: 113.5 x 35.0mm (without wing screw and wings); Weight: 0.8 kg;