Took a guess on the size and lucked out. Have enough for the future.

Simple design to go under a small wheel. Will be ordering another set for our guest bed room. Wish they made them for reclining sofas! Put two of these under front wheels of bbq pit.

It feels super sturdy. It is much safer now.

Wheel stoppers elevate the file drawer wheel slightly when the drawer is retracted.

Reviewer says they would only adhere well to a smooth, slick flooring only. Wasn't worth the $. Maybe good for small-diameter bed rollers, but grossly inadequate.