Magcraft NSN0615 3/4-Inch by 3/8-Inch by 1/8-Inch Rare Earth Ring Magnets, 6-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 0.750-Inch (19.1-mm) diameter, 0.375-Inch (9.5-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 4-Pound. Maximum working temperature is 176-Degree Fahrenheit (80-Degree Celsius). Magnets may chip and crack if allowed to snap together.