This screen table jig set by make-2-fit is constructed of extruded aluminum and comes in a mill finish. Using a bench top jig set like this one allows the screen to be held firmly and squarely in place while installing screen fabric. The set includes five bars (two bars are drilled for fastening to the workbench table, and three are free moving bars), and 12 movable aluminum screen frame clips for 3/4 inch frame. This set is easy to install.