Mini Bifold Barn Door Hardware Kit 48"/4FT Sliding Track for Closet Cabinet-Fit Max Two Folding 22" Door Panels 42" OpeningHeavy DutyCarbon Steel with frosted black surface, water proof, rust proof. The roller, combined of high quality bearings and nylon wheels, matched with 4mm thick track, and the bottom pivot plate,which ensures the system slide smooth and quiet. compatibilityFit Door Thickness: 13 16"~1"(20mm~26mm). Per Door width: Max 22"; The track length should be door opening size + 4",at least 3 3 4" clearance needed from top of door and the desk. Door Weight