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-inch 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.