Features Double Bearing: Equipped with double bearings to ensures stable rotation and avoid unevenness during rolling. Firm Structure: Forged with cast iron, the widened and thickened structure is very reliable under heavy load. Quicker Moving: 3.5in wheel enables smooth rolling and free swivelling as well, making the moving much quicker. Practical Uses: Can be installed on trolleys or carts for transportation in airports, hotels, warehouses, etc. Easy to Install: Light in weight and compact in size, the easy installation can be quickly completed in minutes. Specification: Item Type: Swivel Caster Product Material: Cast Iron Board Size: Approx. 64 x 94mm / 2.52 x 3.7in Wheel Diameter: Approx. 90mm / 3.54in Wheel Width: Approx. 29mm / 1.14in Installation Height: Approx. 125mm / 4.92in Product Colour: Black Use Scenarios: For airports, hotels, warehouses, trolleys.  Package List:1 x Swivel Caster Package List 1 x Swivel Caster