DIYHD Raw Material Box Track Double Sliding Barn Door Hardware,Wall Mount KitHardware Only,Not Including Door PanelMaterial:Steel;Surface:Raw MaterialThe kit can be used for interior door and outside doorFull set kit includingBox track*2+track connector*1+wall mount bracket*4+End cap*2;Roller*4;Stop*4;L guide*4Wooden plank required for installationThe gap between door and wall is super small.The wooden plank can creat the space and prevent the door from rubbing against the wall.Plank width:5 1/8";Thickness:1/2" for reference.If you have thick baseboard or door frame,please also count them in.Wooden board required for installationSuitable for door thickness:1 3/8"~1 3/4"Please adjust roller screw's location to make a bigger gap between 2 doors for thick door.2 rollers can hold 1 door MAX weight 330lbs.Mainly designed for exterior door.Box track hardware is a little bit noisy than interior barn door hardware.