SM Series cases are 0.062-in. aluminum with alodine finish and are designed with a 19-in.-wide front panel of 0.125-in. etched and anodized aluminum. Models are available without vents or side panel chassismounting holes or with top and bottom vents and side panel chassis-mounting holes. They are available in four heights: 3.5, 5.25, 7, and 8.75 in., and four depths of 10, 13, 16, and 20 in. Options include heavy-duty aluminum handles and internal-mounting chassis.