The SMBN0493 block neodymium magnet is made from high performance N42 NdFeB, with Nickel coating. The dimension of this item is 7/8″ × 7/8″ × 1/16″ thick, magnetized through thickness, with the tolerance of ±0.004″ × ±0.004″ × ±0.004″. The weight of this super strong neodymium magnet is 0.0129375 lbs. It can pull up to 6.67 lbs steel. And the surface field is up to 842 gauss.