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Product Description Pack of 1. 30mm [1.18"] x 20mm [0.79"] x 20mm [0.79"]. 4.5mm [0.18"] hole. 4.5kg [9.9 lbs.] pull. 500 degree Celsius [932°F] operating temperature. Protective epoxy coating. This magnet is popular in engineering and manufacturing industries due to its strength, operating temperature and corrosion resistance properties. The Alnico magnets North and South poles are on opposite ends which makes it perfect for classroom demonstrations. PLEASE NOTE – All imperial measurements [Inches (“) and Pounds (lb.)] are rounded conversions from metric [Millimeters (mm) and Kilograms (kg)] production measurements and should be used as approximations only. Set Contains: 1 x 30 x 20 x 20mm magnet(s)