Much like European hinges, this sliding door hardware is fully adjustable and easily installed. The four plastic guide heads are recessed into 30mm holes and held with screws.
The two lower guides have adjustable height rollers; the two upper guides have spring-loaded bar guides, which let you snap a door into place.
Both fit in 1/8" dadoes (top and bottom), the standard kerf of most saw blades. For doors up to 26 lb in weight. Installation instructions and mounting screws included.