SKB's latest design takes the 24" case design and adds depths of either 28" or 30" deep for products such as deeper computer servers from companies like Dell and Compaq. These new cases have all of the same great features as the 24" deep Roto Shockmount Series. The 30" deep design includes traditional threaded steel rails, while the 28" deep design includes the SKB Adjustable Rail Conversion System (ARCS).