This neodymium block magnet is made of a grade N45 magnetic alloy blend and is coated with a nickel-copper-nickel triple layer coating. It is very powerful and has about 77.5 lbs holding power when pulled directly and placed on steel that is at least 3/4 thick. Hanging strength is less. This magnet has innumerable uses as a holding magnet but is also great for an assortment of both industrial and personal applications and can be used in an almost unlimited amount of ways.