This rare earth block magnet has a length of 5mm, a width of 4mm and a height of 3mm. It weighs only 3 grams and with a grade of N42SH, its pull force is 630grams. It has a maximum operating temperature of 150 degrees celsius.

Neodymium magnetic blocks come in a variety of sizes and strengths. These rare earth magnets are the strongest magnets. This particular block magnet is epoxy coated which gives a black appearance. The very thin coating provides a strong barrier against salt and water. This makes these permanent magnets ideal for use in marine, industrial and agricultural surroundings. The epoxy coating will also support the magnet when there is friction or knocking. 

These magnets are commonly used by skillful people who create things including home improvement solutions.