Review on Kamtop 8 PCS 6-8Mm (15/64-5/16 Inch) Square Glass Clamps, Adjustable Stainless Steel 304 Flat Back Balustrade Staircase Handrail Mounting Brackets by Michael Herrera

If you have shopped for GLASS CLAMPS, you know these were the best price. However, you get what you pay for. After installing 54 of these clamps, within 1 day, I noticed most of my panels of glass were sliding downward with gravity. They do not hold the glass tight enough. I have large panels, 60" long by 30" high, and 3/8" thick. I used 6 clamps on this panel, three on the top, and three on the bottom. Still they failed to stop the glass from sliding down. The difference between these cheap clamps, and the more expensive clamps, is that the better clamps have a solid piece of rubber providing much more surface contact to hold the glass. These cheap clamps only touch the glass on the outside edges of the rubber, the inside is hollow, for some reason, maybe to save money? I needed to order some silicone rubber Durometer 70, and replace the factory rubber with pieces of this new rubber I bought, in order to stop the glass from sliding.Bottom line, you get what you pay for.ALWAYS!