Plunger with 1 mm thick protruding ring. It is part of the 16 mm diameter System hitch system. It is made of Zamak, an alloy of aluminum, magnesium, zinc, and copper, with an exceptional quality zinc plated finish. M10 millimeter thread where the screw is placed and a hole for the bolt coupling. This plunger has an embedment depth of 20mm and can be installed in boards at least 25mm thick. To carry out the assembly it is necessary to drill with a center 21.5 mm from the edge. The packaging brings 1000 units.