DIYHD 6.6FT Rustic Black Sliding Barn Door Hardware Track Kit-1 Side Soft Close Operation Hardware Only,Not including door panel;Material:Steel,Color:Black;Suitable for door thickness 35-40mm;Can bar max weight 80kgs This post is for sliding barn door track kit with one side operation soft close mechanism;The soft close damper is hidden behind the rail,it slows the doors bringing them to a soft stop in their final position. The soft close mechanism holes had been pre-drilled between first&second track&wall spacer holes,and the plastic mechanism had been pre-fixed on the track to make full system easy for installation;Never use excessive force, this may damage the internal mechanism.If you found the soft close mechanism not work very well,please adjust roller's location and T trigger's location Package's including:Roller*2;Stopper*2;Sliding track*1;Track&wall connector*5;floor guide*1;Anti-pad*2;Soft close mechanism with screw*1;System trigger with screws*1