Eclipse Magnetics M16595SKM Alnico U-Shaped Magnet, 2-1/4" Length x 2-5/8" Width x 15/16" Thickness U-Shaped Alnico Grade 5 material, painted Red with a maximum temperature of 550 degrees C Length, width and thickness tolerances of +/-0.045" Come keepered (non-magnetic metal plate) to reduce damage 2-1/4-inch length, 2-5/8-inch width, 15/16-inch thickness, 2-5/8-inch width across the poles, 1-3/8-inch gap between poles and 1/4-inch mounting hole size Maximum pull of 42 pounds