5" x 1-1/4" Element Wheel Threaded Swivel Stem Caster, Exp. Adapter - 250# Cap5" x 1 1 4" Element Wheel w Expandable Stem Adapter The Element wheel is quiet rolling, provides a cushioned ride, and is impact resistant, making it a great wheel for carts that carry sensitive cargo. With a rounded tread, this wheel works well on both carpet and hard floors, and the high performance thermo elastomer tread works great over bumps and thresholds. When used with a delrin bearing, this wheel is water resistant and can be used in wash