Check the listing for details. U Groove Ball Bearing Roller, 6 x 24 x 9mm Guide Wheel, White Pack of 4. Condition: New. Listed at 16.96 USD. What is this?U-groove pulley wheels are designed for smooth and quiet operation in various applications such as furniture hardware accessories, sliding doors, windows, and mechanical equipment.What will I get?You will receive a pack of 4 White wheels, made of plastic and stainless steel, which can support a loading weight of up to 77 KG (169 LB). It fits the 2/7" round tube orbit.Wheel Overall Size: 6 x 24 x 9mm / 0.24 x 0.94 x 0.35 inch (Inner Width*Diameter*Outer Width)Groove Size: 6.4 x 3mm / 0.25 x 0.12 inch (Width*Depth)Are there any advantages of the product?Sturdy stainless steel construction with rust-resistant plastic wrap, smooth and silent operation from internal lubrication. U-shape groove design, can endure heavy loads and continuous use while maintaining performance.