The 28" Deep 4U Roto Shock Rack by SKB is an ATA rated roto-molded shock and water resistant rack with wheels. It's compatible with any 19" rack-mountable gear but has been especially designed for deep rack-mounted components such as Dell and Compaq servers.Built for impact, the Roto Shock has eight adjustable elastomer shock absorbers with provisions to add more shocks for heavier loads. Another convenient feature is SKB's ARCS (Adjustable Rail Conversion System) which allows adjustment of the rack width by half an inch on either side for those components designed slightly under the standard width.The compound hinged doors have recessed stainless steel latches that help ensure a secure close. Gasket sealed doors and a pressure relief valve also add to this airtight design. The latches are replaceable in the field and the 4" wheels are removable but regardless, the Roto Shock stacks securely with or without the wheels on.