Orange "PowerPlate" Magnet features rounded metal plates on the long edge which intensifies magnet strength. Nylon-coated magnet is 2-9/16" by 11/16" by 5/8". For inserting magnet use a balling gun with a 7/8" head such as our BG3 or our 29361 Gun with 29358 Head. Box of 12 magnets weighs 2.75 lbs.