Heavy duty, permanent magnet assemblies hold large or small tools and metal parts securely in place. Available in nickel-plated or powder-coated black. Perfect for workshops, garages, manufacturing facilities, and even inside trucks and vans. When mounted, these tool holders are held firmly in place by welded tabs, with 1/4? holes for screws. 20 lbs. pull strength per inch. Mounting screws included. * * 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.