Manufacturer specifications for the Prime PB525106 surge protector do not explicitly publish official screw mounting measurements. • Physical Unit Dimensions: 1.63 x 5.36 x 14.76 inches • Best Practice: Because exact center-to-center keyhole slot spacing is not provided in the technical data sheet by Prime Wire & Cable, you should measure the distance directly on the back of your physical unit with a ruler or tape measure before marking a wall.