Homacer aims to provide the best value products and services to save your time and money when you think of installing a sliding door at your home. Pre-install notice: Only the hardware is for sale, doors are not included. If you are installing the hardware on a concrete wall, please send Homacer a message asking for bolts specifically for concrete walls. The hardware package only has lag bolts for wooden wall or drywall. Homacer sliding barn door hardware kit is compatible with door thickness. If you have thinner or thicker door, please contact Homacer for the correct length of the hex bolts of the hangers, or you can get them from your local hardware store. Please also notify Homacer to put spacer extensions in the package if you have thicker doors. The spacer extension will extend the track further from the wall to fit the thicker door. If you have a door trim, you’d better put a header board that is as thick as the trim and then attach the hardware to the header board. From the top of the door to the ceiling, you need to have clearance for u shape bracket bypass hardware. All tracks that are under coming in one piece. All tracks that are above are connected by two tracks using a junction plate.