Feature: 1. STANDARD SIZE: U groove track pulley, which have standard diameters and mounting apertures, compact in size and are easy to install and replace. 2. STAINLESS STEEL: The roller is made of stainless steel, with high hardness, rust and corrosion resistance, and can be used in outdoor environments. 3. DETACHABLE DESIGN: The pulley is detachable, and the pulley base is attached with 10mm mounting hole, which is suitable for more usage scenarios. 4. DOUBLE BEARINGS: The internal double bearing design can reduce friction with the wheels, ensuring stable and flexible, with strong maneuverability. 5. MULTIPLE USAGES: Suitable for electric toys, sliding doors, industrial carts, assembly jigs, containers and shelves, etc., with a wide range of applications. Specification: Item Type: U Groove Wheel Material: Stainless Steel Wheel Diameter: Approx. 48mm / 1.9in Groove Width: Approx. 16mm / 0.6in Wheel Thickness: Approx. 22mm / 0.9in Base Size (L x W x H): Approx. 28 x 31 x 44mm / 1.1 x 1.2 x 1.7in Base Thickness: Approx. 3mm / 0.12in Base Hole Diameter: Approx. 10mm / 0.4in. Package List: 1 x Pulley Note: Match the appropriate model size before use.