Heavy Duty Plate/Slab Dolly  Heavy-duty plate/slab dolly with auto-clamp feature. Unique design grips plate/slab when weight is added. Opening for use with maximum 4" thick plate/slab. Hand holds are great for carrying. Strap (not included) can also be hooked to hand holds. Several different types to choose from. Steel construction with padded inside.  Please See Chart Below And Select Correct Size.