30mm od x 20mm id x 10mm thick Neodymium Ring Magnets N35 Super Strong Rare Earth Donut Magnets Home Depot

The R-30-20-10-N is a very affordable little ring magnet. Excelent for use in model miniatures, custom packaging, jewelry and even small electronic devices.

This product measures 30mm in diameter and 10mm in thickness and features a 20mm hole through the thickness of the magnet. It is made of a grade N35 neodymium, iron, and boron magnetic alloy blend. They are plated in a nickel-copper-nickel coating for a shiny corrosion resistant finish. Neodymium ring magnets are perfect for use as magnetic fasteners around the home or for use in commercial applications.

Please note that all neodymium rare earth magnets are fragile and require caution when installing to prevent shattering the magnet, and when handling due to their brittle nature and to avoid injury due to pinching.

Material: Sintered NdFeB. Grade N35
Pole Orientation: Axially magnetized, the poles are on the two flat surfaces
Coating: Ni+Cu+Ni 3 layer coating, the best available.
Tolerance: The tolerances of all the dimensions are +/-0.004in with coating.

PLEASE NOTE:
All magnets may chip and shatter, but if used correctly, can last a lifetime.
Keep away from pacemakers.
Not for children, parental supervision required.
If damaged please dispose of completely. Shards are still magnetized and if swallowed can inflict serious damage if magnets join inside the digestive tract.