... that the screw is flush with the magnet end face. The countersink is only on one side of the ring magnet so the A version has the ... countersunk end as a North Pole and the B version has the countersunk ... (392°F)N28AH-N35AH220°C (428°F)Magnet ShapeDisc, Cylinder, Block, Ring, Countersunk, Segment, Trapezoid, Irregular shapes and more. Customized ...