As long as you measure and are sure you need that size, they will work for you. I have had Plastic Supports supplied by Cabinetry in my kitchen, bathrooms and living areas. I think the ones on the open shelves (the ones not behind the doors) have started to fail due to exposure to light. One day, an entire shelf of decorative glassware fell onto the tiled floor. noise and chaos! Scared me into the next week, and it took almost as long to find all the scattered broken glass. It's much more convenient for me to have strong metal. Two things to note (besides the size): you'll see them from below, but only if you're super picky, and the shelf is about 1/2 inch lower, which may require some spacing adjustment.
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