Slide-Co 16466 Closet Door Tandem Roller with 1-Inch Flat Nylon Wheels Twin flat edge 1 inch nylon wheels Wardrobe door roller Top center mounting adjustable bracket Twin wheels Adjustable bracket 1in. O.D. flat edge nylon wheel fits 3/4in. to 1-3/8in. thick doors 5/16in.-18 Threaded Shaft