ive owned several of these and use them in a busy shop. the little rollers inside make the drawers open and close very easy and smooth for getting things in and out of them all day without jostling the stuff in the drawers. most other plastic drawers are not like these. they do not open smooth and have a solid quality feel. many of them are flimsy and have little tabs that keep the drawers closed, so when you open and close them they flex and the contents of the drawer get knocked about. im very dissappointed that these are so hard to find now.