20mm x 3mm x 5mm Hole Neodymium Countersunk Ring Magnets N42 Strong Disc
Very Strong 20mm x 3mm x 5mm Hole Countersunk Disc N42 Neodymium Magnets. N numbers range from N27 - N52. 3mm with 5mm countersunk hole. Neodymium is about as common as tin or lead. Neodymium Magnets.