Each powerful magnetic assembly has a durable nickel-plated cup with mounting hole. Extra strong bases can suspend speakers and spotlights. Add an attachment to center hole to hold lights tools plants and more to steel surfaces. Also useful for P.O.P. displays and in-store signage. * * 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: .18 in. Width: 1.21 in. Color: Silver Material: Ceramic Product Type: Round Base Magnet Pull Capacity: 10 lb. pull Number in Package: 2 pc MGOe: 3.4 Packaging Type: Clamshell Telescoping: No Usage: Add a hook or knob to hold lights and other items to any ferrous metal surface Round Base Magnet measures 1.21 Dia. x 0.18 Thk. .133 hole. 11 lbs. Pull. Magnetic on one side only.