General Tools and Instruments Alnico magnets featuring aluminum, nickel, and cobal alloy are built for heavy duty use and will not naturally demagnetize over time The strong magnetic pull of these industrial grade magnet makes it perfect for lifting, holding, sorting, clamping or retrieving steel or iron parts Alnico magnets will retain their magnetic force indefinitely; removable keepers insure a long life and optimum performance These horseshoe magnets feature a hole on top for attaching to conveyors, racks, welding jigs, and other applications This strong magnet weighs 6 ounces, measures 1-3/4 in. width x 1-1/8 in. height x 1-1/8 in. depth, the opening between poles is 7/8 inch and the cored hole is 3/16 inch; pulls up to 30 lbs, Weight: 0.4 pounds, Manufacturer: General Tools