The Ironwood 2x Stair Climbing Wheels Tri Wheels Shopping Cart Caster is a durable and reliable caster designed for easy maneuverability on stairs. With a size of 12 inches tall and 6 inches per wheel, it provides stability and traction for smooth operation. Made of iron, this caster is built to last and withstand heavy loads. Perfect for shopping carts, utility carts, or any other material handling equipment, this tri-wheels caster from Ironwood is a practical and efficient choice for businesses and industrial use.