Barn Door Hardware Bottom Floor Guide & Barn Door Stopper for Sliding Barn Wood DoorSliding Barn Door Stop Function: The barn door stoppers, installed on both ends of the rail, to prevent the wheels from sliding out of the rail. The spring design minimize sounds when opening and closing doors, and minimize the impact for the whole system when operation. Suitable Track Width: Fit for 40mm 1. 57 width and within 6mm thickness track. Material: High Quality Space Aluminium; Pure Nylon cover; Surface: Black. Anti rust, corrosion