Martin Yale DRS3 Master Rack Sections, Ring Section-2" Wide, Designed to Securely Hold Catalogs and Other Reference Materials for Placement in Catalog Racks (DRS-3 DR-S3 D-RS3) Securely holds catalogs and other reference materials. Use with punched magazines, catalog and single sheets. For any Master Products catalog racks with unique tongue and groove system. Heavy-gauge steel for long-lasting wear.