The SMBN0433 block neodymium magnet is made from high performance N42 NdFeB, with Nickel coating. The dimension of this item is 1/4″ length × 1/2″ width × 3/16″ thick, with step IN, magnetized Through Thickness, with tolerance of ±0.004″ × ±0.004″. The weight of this super strong neodymium magnet is 0.0058125 lbs. It can pull up to 5.92 lbs steel. And the surface field is up to 4777 gausses.