Magnetic Mount, in Protective Chrome Plated Metal HousingDescription:This Magnetic Base Has a Powerful Ring Magnet Protected by a Chrome Plated Metal HousingUnfortunately We’re Unable to Quantify Their StrengthAttach a Hook, Eyebolt, Knob, etc. to the Magnet to Provide a Great Solution for Hanging ObjectsOverall Dimensions: 3.25″ Diameter x 0.415″ Height of HousingCenter Hole Size on the Metal Housing: 3/8″ the 2 Smaller Holes Are # 8Sold IndividuallyArnold Magnetics, LTD43771A