These bi-fold closet door top pivot and top guide are constructed of plastic and come white in color. The outside diameter of these guides measure 3/8 inch, and the base diameter measures 3/8 inch by 1 inch in height. These guides are designed to for use on the primary pivoting leaf of a bi-folding pair of doors, as well as to slide effortlessly within the bi-fold track above the doors. Bi-fold closet door top pivots and top guides like these are easy to install, and they are used by a variety of bi-fold door manufacturers.