Magnetic umbrella holder

This is an umbrella holder on steel door. It attaches to the steel with a Round NdFeB magnet. Size of the available magnet is 12mm×3mm or 13mm×2.5mm. Four magnets in total are necessary. Magnet is secured with adhesive.
If magnet is sliding down, please put the Vinyl tape. It plays a role as the non-slip strip.

http://www.dx.com/p/12x3mm-round-ndfeb-magnet-silvery-white-5pcs-417250