I own a glass company and use them to tile heavy duty brass shower door hinges. I've used them for years and only use Hillman because they seem to be the only high quality plastic anchors out there. They're heavy, cheap and I've never had a problem with them in almost 20 years. They are very strong and will not bend, twist, chip or fall apart when you place them on the surface and screw them in and they hold tight. Arrived quickly with Paime. I will definitely keep buying.