Can you remove the bolt completely so you can put a wood screw through the hole and attach it to a wall?

the housing is glued to the magnet and may be damaged when you try to remove the housing. I did not try this. The screw will come off the housing without a problem.

Can you swap out the mounting bolt with a long peice of all thread?

Hello, thank you for your inquiry. The mounting bolt for this magnet is permanently fixed in this product, but Master Magnetics does offer the same magnet with an attachment hole to accommodate thread, hooks or other fasteners. Search ASIN #B00IYFNXR0. If you have additional questions, please feel free to contact our Magnetic Solutions Team at 1-800-525-3536.

what kind of hardware does it come with? stainless, zinc coated steel, galvanized steel?

Hello, thank you for your inquiry. The magnet is ceramic. The casing holding the magnet is steel that has been chrome-plated. Hopefully this is helpful; if you have additional questions, our Magnetic Solutions Team would be happy to help at 1-800-525-3536.

Can these hold a small light bar on a car for a temp hold and will they hold driving on local or highway speeds

If you are mounting a light bar on the roof of your vehicle it is quite likely blow off at highway speeds. This also would depend on how many you would use. Paint also reduces force.

Ceramic Round Base Magnet with Bolt and Nuts Pack - Heavy-Duty Strong Magnets - 35 lb Pull Each - Nickel-Plated - 2.04" D - 1.25" H - 5-Pack

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