The SMBN0485 block neodymium magnet is made from high performance N42 NdFeB, with Nickel coating. The dimension of this item is 3/4″ × 3/4″ × 1/4″ thick, magnetized through thickness, with the tolerance of ±0.004″ × ±0.004″ × ±0.004″. The weight of this super strong neodymium magnet is 0.038125 lbs. It can pull up to 21.94 lbs steel. And the surface field is up to 3387 gausses.