Check the listing for details. 2Pcs Groove Wheel Caster U Type 2.5 Inch 551 Lbs Capacity Cast Iron. Condition: New. Listed at 33.72 USD. The groove wheel caster is suitable for suitable for sliding doors, yard doors, garden gate, garage doors, rolling shutters, inverted tracks, window traction, rail machine parts, industrial equipment, wire rope rails, storage racks, pet enclosures, and more.Specification:Material: Carbon SteelLoading Capacity: 250 KG/ 551 LBSHole Central Distance: 28 x 77mm / 1.1 x 3 inchHole Diameter: 7mm / 0.3 inchWheel Diameter: 60mm / 2.5 inchWheel Width: 28mm / 1.1 inchSlot Size: 10 x 25mm / 0.4 x 1 inch (Deepth*Width)Bracket Thickness: 2.5mm / 0.1 inchTotal Size: 90 x 41 x 72mm / 3.5 x 1.6 x 2.8 inch (L*W*H)Packing List: 2 x Groove Wheel CasterAdvantage:The U-type groove wheel caster is crafted from quality galvanized steel, the U-groove wheel is both waterproof and corrosion-resistant, providing sturdy durability.