I bought 50 pieces to make dressers and bedside tables for my kids. They're nice and simple, much easier to use than steel rails. Sturdy enough for small boxes. I decided to cut and slot the supports for them from 3/4" poplar instead of using metal supports, which worked well. One thing I really recommend is the support rail and the bottom of the drawer where they are meet each other, sands very well.Plastic.I also used beeswax to effectively smear the wood to make it easier to slide over the plastic.Will buy again for my next project.