ATOM Atom Living Tech FA-1100-BY FA Adjustable Door Roller, Y-shaped Rail Dedicated 《B-02-13》 The FA-1100-BY is a building hardware fitting with a φ28mm cap type and an adjustment range of 6mm to 11mm. This is for a set of 4. - Model Name: FA-1100-BY - Size: 43mm x 48mm - Diameter: φ28mm - Mounting Method: Cap type - Adjustment Range: 6mm〜11mm I purchased these by mistake, so they are unused, only opened. Everything in the photos is included.