5" x 1-1/4" Polyolefin Wheel Swivel Caster with 3/4"-10 x 1" Long Threaded Stems - 300 Lbs Capacity (Set of 4)5" x 1 1 4" Heavy Duty Plastic Wheel Swivel Caster with Total Lock Brake Part # EPO7KIT Plastic caster wheels are solid injected molded polyolefin which yields a high shock load, impact resistant, and abrasion resistant wheel. These wheels are lightweight yet hold high weight capacities and are also non marking. They also are washable, impervious to water, and highly resistant to solvents, oils, grease, most chemicals, and cleaning solutions. These