Slotted Panel; Elongated Vent Holes; 1.2mm; Flanged for Rigidity; 1U/ Cold rolled 16 gauge steel construction - Black powder coated finish - Exterior Dimensions:Length: 19 Inches - Width: 0.5 Inches - Height: 1.75 Inches / Cold roll 1.2mm steel construction. Slotted panels have elongated vent holes for air circulation, Flanged for rigidity