1/2" dia. x 1/2" Lg., Tap - #10-24 x 1/4" dp., Max. pull - 5.3 lbs., One Pole Cyl. Magnet in an Alum: Lifting Accessories: Amazon.com: Industrial & Scientific
Essentra Components - RCP-080-T - Fan Filter Assembly, 80 x 80 mm, Nylon Guard and Cover, Fiber and Steel Filter - RS