CMS MAGNETICS – Neodymium Ring Magnet Grade N45 OD 4" x ID 2" x 1/2", Strong Industrial Quality Rare Earth 1-Piece

Be very very careful with this magnet.

This came in the mail within one day. It was packed well... although I did not see a warning on the package warning mail-room workers of the potential harm to electronics. This thing is SUPER strong. I've already mashed my hand setting it on a metal table. It seems a little brittle.... but I think that's the characteristics of a magnet. I wish it was 1" thick rather than .5"s thick.... but that would double the costs.

arrived way faster than expect! worked well for a macgyver application I had.