Cutler-Hammer Filler Plate, For Use With: WMB Style Meter Breaker, BR Series Loadcenter, 1 Inch Pole Space, 2-1/2 Inch L x 1.1 Inch W x 1/4 Inch H SPECIFICATIONS Suitable For Use With : WMB Style Meter Breaker, BR Series Loadcenter Specifications : 1 Inch Pole Space Dimensions : 2-1/2 Inch L x 1.1 Inch W x 1/4 Inch H Standards UL Listed