National Hardware Zinc-Plated Up to 2-1/4 In. Steel Barn Door Stay RollerDesigned for use as a guide on large, sliding doors up to 2 1 4" thick by side mounting to building Embossed frame with two wings provides greater bracing and holding strength versus conventional single support, corner iron frame Delrin wheel ensures rust free operation and is formed to prevent dirt from clogging or accumulating Wheel is reversible; it can be used on either side of frame Convex roller wheel prevents gouging of door Roller is adjustable