U-shaped grooved wheels are suitable for production line track or ground action. U-shaped bracket design is adopted, which makes the operation smoother and your gate will move quietly and steadily.Nylon wheels + cold-rolled steel brackets ensure strong toughness and strength, and high-hardness bolts can firmly fix the U-grooved wheels to ensure their normal operation.Use gravity and sliding for lifting work, designed to hang heavy objects or reduce loads in indoor and outdoor applications.Name: U-shaped track wheelMaterial: NylonBracket: cold rolled steelBearing: Rolling bearingCondition: 100% new***Wheel diameter: 1.2in/32mm, 2in/50mm, 2.5in/60mm, 3in/79mm, 4in/100mm***Total height: 41mm/1.6in, 62mm/2.4in, 73mm/2.9in, 90mm/3.5in, 116mm/4.6in***Inner groove width: 17mm/0.7in, 19mm/0.7in, 21mm/0.8in, 20mm/0.8in, 22mm/0.9in***Installation aperture: 6mm/0.24in, 7mm/0.28in, 12mm/0.47in, 6mm/0.24in, 7mm/0.28inMounting plate thickness: 2.5mm/0.1inSingle carrying capacity:1.2in carrying 100KG/220 lbs;2in load 200KG/441 pounds;2.5in load 200KG/441 pounds;3in carrying 300KG/661 pounds;4in carries 350KG/772 lbs.The package includes:2x sliding door U-groove wheels