Features STAINLESS STEEL: Wheel roller pulley is made of stainless steel, rust-proof and durable, perfect for home, office, hotel, etc. SIZE SPECIFICATION: Double wheel roller pulley has a longer life span, wheel outer diameter is 12mm, base length 69mm, base thickness 16mm, mounting hole diameter 4.4mm, hole spacing 53mm. SMOOTH AND NOISELESS: Double wheel roller pulley slides freely without jamming, smooth and noiseless, so that you can feel comfortable during the process of pushing and pulling, without disturbing the rest. 4 PCS IN SET: Double wheel roller pulley 4pcs set, meet the daily needs, convenient installation, easy and simple. WIDE APPLICATION: Double wheel roller pulley set is widely used for sliding doors, window, cabinets, etc. Specification: Item Type: Wheel Roller Pulley Material: Stainless Steel Wheel Outer Diameter: Approx. 12mm / 0.5in Base Length: Approx. 69mm / 2.7in Base Thickness: Approx. 16mm / 0.6in Installation Hole Diameter: Approx. 4.4mm / 0.2in Hole Spacing: Approx. 53mm / 2.1in Package List: 4 x Roller Pulley Package List 4 x Roller Pulley