There is no other mover’s dolly on the market like the New Haven Slip-Pruf® 4 Wheel Dolly. Frame ends are mortised, countersunk and bolted to keep the Slip-Pruf® frame true. All frame corners are rounded under the rubber bumper to provide extra air-cushion corners. Side rails are kiln dried hardwood. The Slip-Pruf® rubber cap is securely fastened to the head rails for holding power. Frame size 18”x30”, available with 3.5”, 4” & 5” casters. For inline stacking capability order NH255C-35 Chicago style dollies.