The SMBN0626 block neodymium magnet is made from high-performance N52 NdFeB, with Nickel coating. The dimension of this item is 3″ × 3″ × 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 0.61 lbs. It can pull up to 101.1 lbs steel. And the surface field is up to 1098 gauss.