This Rixson® Heavy-Duty Center-Hung Top Pivot is a "walking beam" type pivot with a 11/16" (17 mm) diameter pivot pin. The supplied door receiver has a heavy-duty needle bearing and provides a 1-3/4" (44 mm) deep engagement, making it ideal for locations where there is concern of dramatic building settling. These pivots are fully mortised and non-handed. They are supplied with a finished cover plate, plus both wood and machine screws to accommodate most common installations.