I bought these for a rather heavy bottom drawer in a cabinet I'm building. They were rated higher (200 pounds) than others at a similar price, but once installed it was very difficult to get the front of the drawer flush with the cabinet as it still has a lot of movement in the locked position. Overall it does its job but I wouldn't recommend them because technically they do what they advertise but in the most minimal of ways possible. The plastic in the slides appears to be at a maximum weight, and the box only weighs about 40 pounds. Generally bad quality.