Our neodymium round base disc magnets are made of high-quality neodymium material, providing exceptional magnetic strength. Each magnet has a diameter of 0.78 inch (20mm) and a height of 0.22 inch (5.5mm). These strong magnets feature a central countersunk hole and are constructed from NdFeB material with a nickel-plated finish for enhanced durability and corrosion resistance. The steel cup design helps protect the magnet from chipping or breaking, improving longevity. Installation is easy using the included mounting screws, allowing for secure attachment in various applications. These industrial-strength magnets can be used on both metallic and non-metallic surfaces when properly mounted. The countersunk hole is ideal for use with flat head screws or bolts. Ideal for organizing tools in workshops, garages, homes, businesses, and schools. Suitable for holding, lifting, retrieving, and other utility purposes. Color: Black Material: Metal Dimensions: 11.10 x 5.69 x 1.70 cm Package Includes: 1 set of neodymium magnets Note: Image color may vary slightly due to lighting and display settings. Size may vary by +/- 1-3cm due to manual measurement.