These surplus magnets have a tremendous amount of energy for their size which is 1 1/4 inches long, 3/4" wide and 7/16" high. Attach to the top of any steel digging tool and easily snag any iron target present. This magnet attached to a steel digging tool can easily pick up a 25 pound steel ball. You have seen these in detecting books and videos. This is a wonderful tool to help you deal with those magnetic hot rocks. Great for finding meteorites too!