Ring section is designed to securely hold catalogs & other reference materials for placement in catalog racks. Use with punched magazines, catalogs & single sheets. Ring section slides easily into any Master Products catalog racks with unique tongue & groove system. Load on either side of the split ring. One-piece design permits faster sheet changes. Ring section provides greater visibility of contents & has greater efficiency. Design offers 4-1/4" center to center, 7/32" diameter rings for 1/4" holes or larger, & heavy-gauge steel construction with a durable powder-coat finish.