Magcraft NSN0616 1-Inch by 1/2-Inch by 1/8-Inch Rare Earth Ring Magnets, 4-Count
Rare earth magnets are the strongest type of permanent magnet currently made. They are amazingly powerful for their size and have innumerable uses. These ring magnets are 1.000-Inch (25.4-mm) diameter, 0.500-Inch (12.7-mm) inside diameter and 0.125-Inch (3.2-mm) thick. They are magnetized through the thickness. They are composed of grade 40 neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish. Their individual pull force is approximately 5.4-Pound. Maximum working temperature is 176-Degree Fahrenheit (80-Degree Celsius). Magnets may chip and crack if allowed to snap together.