HookMag 1-Inch Neodymium Magnet Base (Female M4 Threads) - 4 Pack
Monster Magnetics® standard M4 neodymium magnet base (4-Pack), compatible with M4 hook and eyelet attachments.
- Heavy duty neodymium magnet - the strongest in the industry
- Zinc plated, suitable for indoor and outdoor use
Each magnet is rated at 25 pounds* magnetic pull force.
*Magnetic pull force rating is certified as measured with test equipment. In layman's terms, this is the force of the magnet against flat 1/2" bare iron.
Equating this to real-world applications?
It depends on where you're mounting it. Different surfaces have different properties (at a molecular level), and they affect the pulling force created by the magnet.
The finish of the surface plays a major factor in the pulling force. Plated, coated, painted, corroded, and rusted surfaces will decrease the pulling power - exponentially.
As an example, you can easily hang semi-heavy hand tools on a tool box...
But a refrigerator with a "slippery" surface may not hold much weight and the magnet may slide.