Magnet is fixed into a zinc-plated steel channel with holding power on one large surface. Includes center hole for mounting. Latch magnets can easily secure cabinet doors, or can be used to hold or retrieve metal objects. Easily secure a parking lot gate or shop door. Each contains a powerful ceramic magnet. 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.