The SMRN0709 ring neodymium magnet is made from high-performance N42 NdFeB, with Nickel coating. The dimension of this item is 1" od × 1/4" id × 1" thick, magnetized diametrical, with the tolerance of ±0.004" × ±0.004" × ±0.004". The weight of this super strong neodymium magnet is 0.199375 lbs. It can pull up to 40.44 lbs steel. And the surface field is up to 6909 gausses.
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