8" x 4" Extreme Duty Kingpinless Rigid Caster8" x 4" Extreme Duty Kingpinless Rigid Caster Introducing our Extreme Duty Kingpinless Rigid Caster, designed to handle the toughest industrial demands with ease. This caster features a durable ductile steel wheel measuring 8 inches in diameter, ideal for heavy loads and harsh environments. The kingpinless design ensures superior performance and longevity under high stress and heavy load conditions. The red, 4 inch wide tread enhances visibility and