Prime-Line N 6761 Door Guide, 2-1/8 in L x 1-1/4 in H Dimensions, Nylon, White, Floor, 2/PK

N 6761 is a three-piece adjustable floor guide. Made of white nylon, the 1-1/4 in tall guides at each end can be adjusted inward to accommodate doors 3/4 to 1-3/8 in THK. Used by many closet door manufacturers.