The SMRN0651 Ring neodymium magnet is made from high-performance N42 NdFeB, with Nickel coating. The dimension of this item is 1/4" od × 1/16" id × 1/8" thick, magnetized through thickness, with the tolerance of ±0.004" × ±0.004" × ±0.004". The weight of this super strong neodymium magnet is 0.00155625 lbs. It can pull up to 2.18 lbs steel.
Download a PDF Specification Sheet