The SMBN0598 block neodymium magnet is made from high-performance N42 NdFeB, with Nickel coating. The dimension of this item is 1″ length × 2″ width × 3/8″ thick, with step OUT, magnetized through thickness, with a tolerance of ±0.004″ × ±0.004″ × ±0.004″. The weight of this super strong neodymium magnet is 0.211875 lbs. It can pull up to 64.38 lbs steel. And the surface field is up to 2959 gauss.