Neodymium Block Magnet - 76.2mm x 50.8mm x 50.8mm | N52 D_21mm-30mm They are 6

They are 6

square neodymium blocks are often used for attracting and storing on its surface ferrous material or foreign metal objects from areas where they present a health hazard or a threat to the operation of sensitive and expensive machinery

or for water treatment purposes

This ferrite ring magnet has an outside diameter of 55mm

building maintenance services and communications equipment manufacturers

Neodymium Block Magnet - 76.2mm x 50.8mm x 50.8mm | N52 D_21mm-30mm They are 6Neodymium Block Magnets Length: 76. 2mm (3" in.) Width: 50. 8mm (2" in.) Height: 50. 8mm (2" in.) Grade: N52 (Extremely Powerful and very very strong) Coating: Nickel (Ni) Magnetized Direction: Through height 50. 8mm Theoretical Holding Force: ~277 kg Surface Gauss: 6,116 Gauss