DescriptionFeatures: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Made of high quality 45 steel and nylon, the caster wheel is rigid strong.4.Each wheel loads up to 100kg / 220 lbs, the caster wheel slides more evenly, stably and loads more on the round tube track.5.Used to inverted track, rolling gate, patio sliding gate, industrial machines, container racks, windows, doors.Specifications:Material: 45 Steel NylonColor: BeigeBrand name: BQLZRTotal Dimensions: 5.5x3.2x4cm/2.16x1.25 x1.57Inch(LxWxT)Wheel Diameter: 3.1cm/1.2InchWheel Width: 2.5m/0.98InchBracket Size: 5.5x3.2cm/2.16x1.25Inch(LxWxT)Hole Center Distance: 4.2x1.8cm/1.65x0.7InchHole Diameter: 0.6cm/0.24InchU Notch Width: 1.9cm/0.75InchU Notch Depth: 0.7cm/0.28InchWheels Height: 4cm/1.57InchMax Load: 100kgWeight: 140gPackage include:2 x Track Roller Wheel