Our This strong magnet is made of three layers of Ni+Cu+Ni. The strong magnetic pull of these industrial grade magnet makes it perfect for lifting, holding, sorting, clamping or retrieving steel or iron parts These Horseshoe magnet for nails have a smooth with a hole on top for attaching to conveyors, racks, welding jigs, and other applications. Alnico magnets retain their magnetic force indefinitely; removable keepers insure a and optimum performance Explore polarity, , and repulsion. Great for hands-on science investigations, STEM projects, classroom labs, science fair, science clubs, home school, and more! Coating are built for heavy duty use and not naturally demagnetize over time. It can also use to doing velvet nails, fishing something, measuring, collecting small metal screws, doing experiments, etc, Manufacturer: Fuhjythy