This is a top-mount bi-fold door pivot that is typically used on Cox bi-fold doors. The spring-loaded 1/4 in steel pin inserts into a pre-drilled hole in the door and the top pivot bracket above, creating a pivot point for your bi-fold door. Each steel pin is self-adjusting and features a mold injected white plastic base. Use with the Prime-Line part N 6577 pivot bracket (purchased separately) for excellent installation results. Unit: EA UPC: 049793065834 Model Number: N 6583