Using these York cast iron weightlifting plates is easy. First, select the appropriate weight plate according to your exercise needs. Slide the plate onto the barbell through the 1' diameter centre hole. When you're done with your workout, store the plates in a dry and cool place to prevent rust. Avoid dropping the plates from a great height as it may damage the cast iron. If the black paint gets scratched, you can use a touch - up paint to maintain its appearance. Remember, this is an oversized item and can't be shipped to rural addresses, so plan your purchase accordingly.