APW line of standard round strike plates for our electromagnets. Sizes from 1.0″ Dia. to 4.0″ Dia. When selecting a strike plate select a strike plate equal or greater than the diameter of your electromagnet. In applications where alignment may not be optimal it is always recommended that you select a strike plate size that is larger than the diameter of the electromagnet. Our round strike plates are all made of 1215 CRS and are Nickel plated.