This is the heavy-duty version of our standard pull-out rail which has more than double the weight capacity of all other standard rails on the market. It features twin & double standard thickness sliding bars for strength and guaranteed load capacity. There are 4 holes (2 at each end) for screws (not supplied) to be used to attach the rail to the inside of your furniture piece (please use the correct type and length of screw to suit the furniture material). The weight rating is 10 kg.