Very powerful magnets. I use two of these to attach professional cameras to the roof or hood of my car. With 200 lbs of combined forced needed to remove them, I know my property is secure from sudden stops, wind, etc. The bolt screws are not standard for cameras as they are intended to attach lights like police lights to a car's top, but these are nice to adapt a rail system for cameras. I would trust an Alexa Mini with these magnets.
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