400 pound grip on 1 / 32" to 1 / 8" thick small steel sheets, angle iron, square tubing, and other flat steel. Grip, pull, and slide steel quickly during cutting and machining operations. Gripping strength varies depending on the thickness, composition of ferrous metal, and surface finish of item. Clean steel surface. place in contact with magnet, and cover the entire length and width of the magnet to properly engage and release.