To make the rubber coated magnets mountable,internal(female) thread are designed on the top.
31mm, 43mm, 66mm and 88mm are typical diameter sizes for internal(female) thread rubber coated neodymium magnets. External thread type are available for all the sizes. Magnetic force of standard internal(female) thread rubber coated neodymium magnets various from 5kg to 40+ kg. Internal(female) threaded magnets with rubber coating are ideal solution if you are looking for weatherproof mounting magnets. There are details on the table for each size. Sizes of any part and rubber color can be customized.