Boss STB19200 8'-10' EXT Straight Plow Blade. Quickly and easily expanding from 8 to 10 feet at the touch of a button, the BOSS EXT is equipped to clean up parking lots and wide open spaces. A true 10-foot width combined with pitched-forward wings lets the EXT take wide passes, carrying and moving more snow more efficiently. At 30 inches high with 9 vertical ribs, the EXT moves a high volume of snow with resilience, making it a versatile and flexible addition to your fleet. Another powerful tool in your plowing arsenal that's built to BACK YOU UP.