SAM Curb Guard Curb Side 1/2 x 6 x 12-1/4 Inch Highway Punch Plate PatternSAM Curb Guards are formed from heavy duty 1 2 in. or 5 8 in. steel, and fit most 9 ft and all 10 ft plows. They have a highway punch plate pattern. Formed from heavy duty 1 2 in. or 5 8 in. steel, and fit most 9 ft and all 10 ft plows. Municipal Highway Plows Highway Punch Plate Pattern. Heavy duty 1 2 in. or 5 8 in. steel. Fits most 9 ft and all 10 ft plows.