Rectangular Neodymium Block Magnet 70 x 70 x 20 mm N45, Nickel - holds 300 kg. Rectangular Neodymium Block Magnets 70 x 70 x 20 mm N45, Nickel - holds 300 kg. Magnetization: N45. Strong rectangular neodymium magnets are widely used during moulding and casting of substances to hold moulds in place this is due to their impressive strength to size ratio.
eBay