The SMBN0599 block neodymium magnet is made from high performance N52 NdFeB, with Nickel coating. The dimension of this item is 2″ × 1″ × 3/8″ thick, magnetized through thickness, with the tolerance of ±0.004″ × ±0.004″ × ±0.004″. The weight of this super strong neodymium magnet is 0.203125 lbs. It can pull up to 76.52 lbs steel. And the surface field is up to 3411 gausses.