D 20 x 4 mm
Material NdFeB Neodymium Shape Disc Size 20mm diameter x 4 mm thickness   /- 0.1mm Grade N35 Operating Temperature ≤80℃ /176F Plating Triple plated (Nickel-Copper-Nickel) Magnetic Face Axially Magnetised Quantity 5-250 Vertical Pull Force 5 kg against minimum 5mm steel plate