38 inch guaranteed straight to within 0.003 inch over the entire length Anodized aluminum 0.4 inch (7/16 inch) thick by 1.750 inch (1-3/4 inch) wide Reference edge is machined flat and smooth Contoured cross section for easy gripping Hanging hole on one end Available in four (4) sizes: 18 inch, 24 inch, 38 inch, 50 inch