These bi-fold door corner repair brackets are constructed of stamped steel and come in a zinc-plated finish. They are for use with 1-3/8 in. thick door panels, and they can be painted to match the finished paint of the doors. These repair brackets are designed to strengthen weak or splitting bi-fold door corners, and they can be installed on the top and bottom corners of the doors. They can accommodate both 3/8 in. and 7/16 in. diameter pivots, and they can be hidden from view when installed on the back sides of the bi-fold doors.