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SUPER STRONG. Each magnet can support 23kg vertically from the magnetic face when in flush contact with a mild steel surface of equal thickness EASILY FIXED IN PLACE. Can be fixed in place with an M5 nut head screw. MULTIPLE USES. Commonly used in large-scale engineering projects or for recovery applications. PREMIUM COATING. Coated with three layers of nickel, copper, and nickel to reduce corrosion and provide a smooth finish. SPECIFICATIONS. 25mm diameter x 20mm thick with a 6mm diameter counter-bored hole for fixing. +/-0.1mm tolerance.