The ABACO 3 Wheel Slab Dolly - SD013-B comes with pressurized tires and a heavy duty, locking brake swivel caster that provides additional stability and maneuverability in confined spaces. Designed to Facilitate the handling and transporting of slabs on the work site. Vulcanized rubber chipping and scratching from slabs Protects channel. The dolly wheels and a pressurized heavy duty swivel casters Comes With locking brake to supply with additional maneuverability in confined spaces and Stability.