SMARTSTANDARD Sliding Barn Door Bottom Adjustable Floor Guide Roller, Black, Smoothly and Quietly, Easy to Install (2 Rollers) 2PCSBRAND: SMARTSTANDARD; Condition: Brand New; Material: Solid Steel and POM NYLON; Surface: Frosted black; Fit door panel thickness: from 2. 31 to 0; Size of roller: 14 5(dia)* 4 5" (H) PACKAGE INCLUDE: 2x floor guide; 4x screws; All necessary hardware is included as you see in the pictures. EASY TO INSTALL: Mount to the wall with screws, and no groove required for door. By adjusting the rollers in the track to fit your door panel. No need to drill