Made up of Polished finish 316 grade stainless steel. Magnets completely shrouded in stainless steel to withstand the corrosive marine environment. Magnetic ball door stopper holder set allows for an easy adjustment for any mating angle. Strong magnet ball holds about 4 kg. Durable and Reliable: Heavy-duty construction ensures long-lasting performance, perfect for marine and outdoor use. Dimensions Extendable Length from 73 mm to 100 mm Package Includes Marine City 1 set of Magnetic Ball Door/Window Stopper Holder–L (screws are not included)