Single Entry Starter Unit. 64-1/4" height with 4-6 tiers. Configurable design allows for adding on units horizontally. Simple installation. Durable cold-rolled steel with a 3/4" flange on sides. Available Options . Media Type: Letter or Legal. Unit Width: 24", 30", 36", 42" or 48". Openings: 4, 5 or 6 Tiers . The uniquely customizable Datum 4Post™ filing system offers maximum efficiency and flexibility, with customization and expansion options to handle the medical filing needs of virtually any medical facility. Configurable and Versatile: The versatile 4Post™ provides organized storage of items of any size or weight while keeping them easily accessible. Its configurable modular design allows you to "grow as you go" - begin with the Starter unit, then select Add-On units to accommodate your facility's storage requirements as needed. This flexible shelving system is easy to install and works well with TrakSlider and MobileTrak moving shelving systems. With pre-punched tops and single rivet bottom shelf supports, it easily attaches to these mobile systems without the need to drill additional holes. Durable: The shelves are made of 22 gauge cold-rolled steel with a 3/4" flange on all sides for additional support. The units are powder-coated for a durable, corrosion-resistant finish. Model: This model has a height of 64-1/4" and a capacity for 4-6 tiers. It is a Single Entry Starter Unit. Single Entry - there is access to the files on only one side of the unit, as opposed to both sides (Double Entry units are available for purchase separately). Starter Unit - it is designed to be a base unit that can be added onto at a later time with Add-On Units (purchased separately). 4 Post Shelving 64-1/4" High, 4 to 6 Tiers - Shelving Options ChartItem #MediaDepthWidthOpeningsShelf Height641224-S4Letter12"24"4 Tiers12-3/4"641224-S55 Tiers11-1/4"641224-S6M6 Tiers9-3/4"641230-S430"4 Tiers12-3/4"641230-S55 Tiers11-1/4"