The C Style line case shells are constructed from 0.040 (24" and larger) aluminum to provide the ultimate in strength and durability while keeping weight to a minimum. Each case uses riveted construction and tongue-and-groove design along the entire aluminum joining edge for precise cover-to-bottom alignment. Cases feature rounded steel corners and bumpers for safety, tubular steel carry handle (black plastic on Model 184 and smaller), continuous hinge (butt hinges on Model 184 and smaller), twin cover stays (on 18" and larger) and locking draw latches. Your equipment and supplies can be further protected with a full foam insert (1/2" top and bottom - 1" layers throughout) that you can cut to meet your needs. A true solid all aluminum case solution!