Magcraft NSN0617 1/4-Inch by 1/4-Inch Rare Earth Rod Magnets, 20-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 rod magnets are 0.250-Inch (6.4-mm) diameter and 0.250-Inch (6.4-mm) long. They are magnetized through the length. 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-Pound. Maximum working temperature is 176-Degree Fahrenheit (80-Degree Celsius). Magnets may chip and crack if allowed to snap together.