Constructed of a magnet embedded in a steel channel,
or a magnet sandwiched between two steel plates,
these magnets provide strong pull for their sizes. Most
come with mounting holes.
Holding power is tested on a flat, machined steel plate,
1/2” thick. If the surface to which the magnet is to be
attached is rough, rusty or painted, the holding force
may be reduced. For critical applications, build in a
safety factor of two or three.