The gremlins that insist on tilting pictures during the night won’t like these. Put a “dot” at each corner of the picture frame, and short of an earth quake, your pictures will stay nice and level. In the shop, they make great no-slip feet for things that aren’t supposed to vibrate onto the floor. There are hundreds of other uses of course, so get plenty. Made of industrial duty clear polyurethane, the dots are packaged on an adhesive backed carrier pad for convenience, and are 0.150" thick. Made in USA.