This is a bi-fold door corner repair bracket for 1-1/8 in. thick doors. Made of stamped steel with a zinc plated finish, they can be painted to match your door. They are designed to repair weak or damaged bi-fold door corners and can be installed on the top or bottom corners split bi-fold doors. They can accommodate both 3/8 in. or 7/16 in. diameter pivots. They are hidden from view when properly installed on the back side of the bi-fold door.