This bi-fold door bottom mount pivot pin is designed to make hanging your bi-fold doors easy, and it functions as a hinge. It is constructed by nylon plastic body, with a screw with a grooved tip type adjustable metal pin,to make hanging your bi-fold doors easy. It's very easy to install, remove, and reinstall your door. It fits on 1 in. to 1.375in. thick bi-fold door. Pivot metal pin's nylon plastic base's diameter is 3/8 in. Colours may vary.