Roto Racks, ranging from 2U to 10U in standard, shallow, rolling, and compact rig versions, are roto-molded of Polyethylene (LLDPE) for extra strength and durability. The exteriors feature SKB’s recognizable bar design that identifies the rack unit size on the front and rear lids. Molded bars on the top and bottom provide interlocking capabilities, allowing you to easily and securely stack Standard Roto Racks, Shallow Rolling Racks, and Standard Roto Rolling Racks for more convenient and secure transport. Lids include rubber gasket seals to keep water out. Other standard features include front and rear steel threaded rails and rack screws (10-32 thread), recessed steel Mil-Spec twist latches, flush carry handles, and non-slip rubber feet.