Material NdFeB Neodymium Shape Disc Size 20mm diameter x 3 mm thickness /- 0.1mm Grade N52 Operating Temperature ≤80℃ /176F Plating Triple plated (Nickel-Copper-Nickel) Magnetic Face Axially Magnetised Quantity 25 -1000 Vertical Pull Force 4.3 kg against minimum 5mm steel plate