4Pieces 1.8 Inch Carbon Steel Rotatable Ball Bearings Ball Caster Rollers

Ball bearing roller: the durable construction that this caster will last for years to come, rolling bearing; Bearing balls: the versatile design makes it suitable for use on a variety of surfaces, including concrete, tile, and carpet, roller bearings for caster; Transfer bearing: this 18 inch ball bearing swivel caster is made of carbon steel for great strength and durability, roller bearing; Heavy duty roller: the ball bearings are wear-resistant and have a, roller wheel bearing; Wheel bearings: the easy to install design allows for quick and easy replacement of existing casters, improving work efficiency, multi purpose dual bearing roller

What's in the box
4 x Castor Wheels