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This suction cup actually works well with sheet metal, but you have to make sure that the sheet is relatively flat when you are pulling the suction on it. If the suction does break loose, the pump automatically starts back up to achieve a suction back on the sheet. I have used this to move around 5' x10' x 16 gauge stainless steel sheets by myself and the cup locks on well and stays locked on while picking the sheet up vertically on its side. It will not pick the sheet up if it is laying flat, though you can lift one end up in order the get it up off of the sheet below it or to just help you stand it up on one edge. I use rechargeable batteries in mine and put them on charge after every use so I can't say how long normal alkalines would last in this, but I really do like the auto pump on this suction cup.
The only things I've been unable to grip with mine are objects in which either:
A. ...the surface is SO covered with particulate matter (e.g. covered in sand, dust, powder/flour, etc.) that the device is unable to form a seal, or...
B. ...something whose surface is not only irregular, but is also too porous to draw a vacuum against (roll of carpet, pile of pumice stone, a screen door, etc.), or...
C. ...something whose surface isn't capable of supporting itself under any circumstances anyway (a pool of water, a pile of gravel, etc.)
...and you know what? That's all TOTALLY FAIR.
One doesn't pick up one of mankind's most effective electromagnets and then grouse about it ""not working on non-metallic items"", or one of the world's most-powerful acids, only to whine about it being ""unable to dissolve glass,"" either (or, at least, not without getting promptly lumped into the category of ""humans I hate on principle"").
I CAN lift plywood, drywall/sheetrock/gypsum board/hardiback, tile, granite, marble, glass, metal of any sort, appliances, floor tools, cabinets, furniture... and gods only know what else I've yet to discover and/or simply haven't thought to experiment with yet! Yanno the old saw about ""it's not heavy, it's just awkward!""? It's genuinely shocking how true that actually is. We were able to move a California King mattress wrapped in plastic with NO problems. It was EASY with something to actually get a positive grip on.
Hell: I was able to stick ONE of them to a finished ceiling, HANG PULLEYS from its integrated mounting brackets, and use IT, in turn, to HOIST A 90lb dust collector EIGHT FEET UP A WALL, then REST IT ATOP A SECOND ONE stuck to a bloody FINISHED INTERIOR WALL, tie off the rope, and leave it there - supported only by their respective suctions - until I had time to climb a ladder and lag bolt it in - OVERHEAD, AND BY MYSELF.
Izzy Swan - genius inventor and all-around roaring badass - has done some really, REALLY cool brainstorming videos surrounding the use of them, too (I'm not affiliated in any way, just trés impressed):
youtu.be/dNxj8_S4inQ
youtu.be/sYwtIWYpPvQ?t=12
So has Andrew Klein (equally-genius, equally-badass-of-the-roaring-variety):
youtu.be/V4P-MRnRROE
Yes: they're expensive. But, I assure you: you'll be stunned how many applications around the shop you're likely to find.
One person found this helpful
I highly recommend this seam setter for anyone working with stone countertops. It's durable, produces great results, and has made my job so much easier.
Lisa Hon –
The GRABO 90 Degree Stone Seam Setter is a game changer! I was able to achieve perfect 90 degree angles every time on my kitchen counters. I highly recommend this tool to anyone in the business.