Post Section is designed to securely hold catalogs & other reference materials for placement in catalog racks. Use with punched magazines, catalogs & other reference material. Slides easily into any Master rack with a unique tongue & groove system. Self-locking section slips together easily. Simple fingertip action triggers the unlocking for sheet changing. When the section is closed, it slips easily into rigid slots in the master base, extension, stand or case. Made of heavy-gauge steel. For 1/4" holes or larger. Center to center 4-1/4".