3/4" (19.05mm) OD x 3/8" (9.52mm) ID x 1/4" (6.35mm) thick, magnetized through the thickness. This is a maximum strength magnet for high temperature applications. The maximum working temperature of 300C makes this a very special magnet. These are not as strong as their neodymium counterparts and they are more expensive, but if you need a strong magnet at high temperatures, this is the one. These are nickel plated to minimize chipping.
Price per piece.