Build-On Brick Light Switch Plate and similar (Set of 2, Bricks Not Included) Compatible with (but not officially-licensed by) LEGO, PixelBlocks, Mega Bloks, KRE-O, or K'NEX Bricks. Designed for a single toggle switch, these grey plates come in a set of two and give you over 18 square inches of brick-building base plate each to customize to your heart's desire. Requires screwdriver and 4 screws to replace your current plates. Two plates included in each pack - Dimensions: 3 1/2 wide x 5 1/4 high Compatible with all major brick building sets.