My company purchased 8 of these for installing glass architectural wall product and they work great. We use them to move and position very large, heavy sheets of up to 1/2" glass, weighing up to 400-500 lbs. With two men and 4 of these grips we have no problem. They suction to the glass with ease and release with ease, and they are very sturdy and have strong grip. They each come in their own plastic hard case for storage which is nice, because once they are damaged you pretty much have to replace them. The case helps keep that from happening.
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