DELTA 50-284 Mobile Machine Base Extension (For 52-Inch Unifence) Heavy-gauge steel and features a foot-operated control lever that raises and lowers the base for easy movement and positioning Base extension used with: 50-273; 50-277; 50-278 Foot-operated control lever raises and lowers the base for easy movement and positioning Easy bolt-on assembly for quick setup Measures 15-1/4 x 41 inches