The SMCN0291 cylinder neodymium magnet is made from high-performance N42 NdFeB, with Nickel coating. The dimension of this item is 3/16″ dia. × 3/8″ thick, magnetized diametrical, with the tolerance of ±0.004″ × ±0.004″. The weight of this super strong neodymium magnet is 0.00280625 lbs. It can pull up to 2.84 lbs steel. And the surface field is up to 6757 gausses.