Each powerful magnetic assembly has a durable nickel-plated cup with mounting hole. Add a hook or knob to hold lights tools plants and more to steel surfaces. * * More About Ceramic Magnets: Our hard ceramic ferrite magnets are composed of iron oxide and barium or strontium carbonate. Ceramic magnets exhibit relatively good holding strength for their price making them a popular choice for many consumer commercial and technical applications. * * Ceramic magnets have so many practical uses including; craft projects refrigerator magnets badge holders latches display boards loudspeakers security systems motors generators & alternators lifting magnets brakes clamps switches & relays sweeper magnets science projects toys games motors magnetic couplings POP displays advertising giveaways promotional items novelties & much more. Brand Name: Magnet Source Length: .303 in. Width: 2.04 in. Color: Silver Material: Ceramic Product Type: Round Base Magnet Pull Capacity: 25 lb. pull Number in Package: 1 pc MGOe: 3.4 Packaging Type: Clamshell Telescoping: No Usage: Use to hold or hang heavy items from any ferrous metal surface Round Magnetic Base measures 2.04 Dia. x .303 Thk. .20 hole. 25 lbs. Pull. Magnetic on one side only.