Slide-Co 16202-B Closet Door Roller Assembly, 3/4 in. Convex Edge Ball Bearing Plastic Wheel, 1/2 In. Offset This wardrobe door roller assembly is used on the back panels of top-hung by-passing closet door systems 1/4 in. thick x 3/4 in. outside diameter wheel with a 1/2 in. offset. Fits 3/4 in. to 1-3/8 in. thick doors These roller assemblies are constructed of plastic and steel components