These bi-fold door top pivots are constructed of steel and come in a zinc-plated finish. They are spring-loaded and feature 1/4 in. outside diameter pins with 3/8 in. outside diameter shafts. These pivot pins mount on the top/back edges of bi-fold doors with nail-down tabs and require 3/8 in. holes. Use these top-mounted pivot pins where hardware is missing, damaged or simply not working properly. Installation of these bi-fold closet door pivot pins is easy, and they will help restore bi-fold doors to the ease of operation they were designed to have.