The SMBN0560 block neodymium magnet is made from high performance N42 NdFeB, with Nickel coating. The dimension of this item is 3/4″ length × 1 1/2″ width × 3/8″ thick , with step IN, magnetized through thickness, with the tolerance of ±0.004″ × ±0.004″. The weight of this super strong neodymium magnet is 0.108125 lbs. It can pull up to 43.51 lbs steel. And the surface field is up to 3839 gausses.