Features 1、Double Bearing: Equipped with double bearings to ensures stable rotation and avoid unevenness during rolling. 2、Firm Structure: Forged with cast iron, the widened and thickened structure is very reliable under heavy load. 3、Quicker Moving: 3.5in wheel enables smooth rolling and free swivelling as well, making the moving much quicker. 4、Practical Uses: Can be installed on trolleys or carts for transportation in airports, hotels, warehouses, etc. 5、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