The pack of two 8 x 3" Ground Glider Caster with Brake from RocknRoller MultiCart is a replacement caster system with clevis pins and cotter pins for the R18RT utility cart. It is also an upgrade caster system for the R12RT utility cart. Each caster features low-profile, no-flat tires around a durable and lightweight hub. When in use, they provide low rolling resistance, pneumatic-like cushioning, and wide load dispersion over soft terrain.