The most obvious difference between STRONGBOX® Heavy–Duty Rack–Mount Chassis and “regular–duty” versions offered by other manufacturers is the thickness of the aluminum from which they are made. The main structural members of our chassis are 0.090″–thick. Similar parts of other units are only 0.040″ to 0.063″. Our heavy–duty chassis provide more than twice the intrinsic strength without using hard–to–machine steel or added internal framework sub–assemblies. Specify STRONGBOX® to keep your project hassle–free.