Our neodymium round base disc magnets are made of neodymium metal material, providing strong magnetic performance. Each round magnet has a diameter of 0.78 inch (20mm) and a height of 0.22 inch (5.5mm). Pull force: 40 lbs or more (vertical pull). These strong magnets with a hole are constructed from NdFeB material and feature a nickel-plated coating for enhanced durability and corrosion resistance. The steel cup design helps protect the magnet from chipping or breaking, improving longevity. Installation is simple with our countersunk hole magnetic discs. Each set includes 24 mounting screws, allowing for flexible mounting options. These industrial-strength magnets can be used on both metallic and non-metallic surfaces. The neodymium cup magnets have a countersunk center hole, ideal for use with flat head screws or bolts. These heavy-duty magnets are ideal for holding frequently used tools above a workbench, keeping them within easy reach. The powerful neodymium cup magnets securely hold heavier hand tools and are perfect for organizing and decluttering workshops, garages, homes, offices, and schools. Suitable for holding, lifting, retrieving, and various other applications. Color: Black Material: Metal Size: 11.10 x 5.69 x 1.70 cm Package Contents: 1 set x Neodymium magnet Note: Light reflection and differences in display screens may cause slight variations in the color shown in the image compared to the actual item. Measurement allows an error of +/- 1-3 cm.