Neodymium Block Magnet - 50mm x 20mm x 12.5mmMagnetic Product Description: This block magnet has a length of 50mm, a width of 20mm and a thickness of 12. 5mm. It has a magnetic flux reading of 3922 Gauss and a pull force of 27. 6 kilos against 5mm mild steel. This is a very popular magnet. Uses for our rare earth block magnets: Used by many engineering companies and industrial supply firms distributing to the tradesman and general public. Used in the mining and manufacturing sectors also.