When these 36 inch drawer slides arrived at my house I knew right away that they would be as good or even better than expected. The packaging and the weight of the guide say a lot about a product. The use of suitable screws, as described in the product brochure, made assembly easier. I'm building a large storage box in the back of my Jeep and these rails, while overpriced for my anticipated needs, are perfect. I've watched countless YouTube videos of similar projects and flimsy or cheap slides and decided that I didn't want to be constantly dealing with unsatisfactory and flimsy slides - so I bought them.