180mm ring magnets

7 inch large ring ferrite magnet 180 x 80/85/87 x 20 mm

This is a large ring ferrite magnet, hard permanent magnet, the performance of the magnet is Y30BH, the size of the outer diameter is 180mm, the inner diameter has a number of sizes, such as 80mm, 85mm, 87mm, 89mm, thickness of 20mm...