Is the holding power 150lbs combined or each one of them?

Yes and no. The holding power may be 150lbs, but that rating is based on attempting to pull the magnet off at a 90' angle relative to the attached surface. Obviously, this rating is not useable, unless you are using it to pickup and drop metals (think electromagnet in a dump yard). The useable force in most situations is the shear force. I haven't measured the shear force on my mags yet, but I would be surprised if it exceeded 50lbs. Note: all magnet hold forces are dependent on the thickness of the metal, up to saturation point. This means that the mag holds stronger on thicker metal. When manufacturers rate the pull forces they use at least 3/8" metal and most users aren't using 3/8" + thick metal, so the force ratings are seldom observed by the average user.

is the yellow portion metal ?

Yes it is metal. The wings also have small holes so it can be screwed to the jig.

Are these waterproof?

Yes and No. They are not electronic in nature so they will continue to work even under water. However they are a mechanical device made primarily from steel so if allowed to remain moist for extended periods of time they would rust.

Does this lose its magnetic hold force over time? What is the expected working life of the magnet?

Rare-earth magnets are permanent magnet in that loose all their force when heated above their Curie temp which is above 300C. They also have a working tem where they begin to permanently loose force is is around 80C. They will lose a very small fraction of force over time(>10 years). So don't get them to hot to hold.

Manufacturer	Magswitch
Part number	8100818
Item Weight	50 g
Product Dimensions	4.06 x 2.79 x 4.83 cm; 50 g
Item model number	878628002832
Size	Small
Color	black and yellow
Style	Modern
Material	Alloy Steel
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

MagswitchMagJig 60

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