Product Details:

Easy Alignment of Door Panels Without Removing the Door
CRL Heavy-Duty Bottom Roller Assemblies are
constructed from durable, long-lasting components capable of
supporting 125 pounds (56.7 kilograms) each. They have a vertical
adjustment of 9/16 inch (14.3 millimeter) for easy alignment of
door panels without removing the doors. Minimum order is one each.