Floor Hugger Dolly. This Low-Profile Steel Dolly allows loading and unloading of materials at floor level. The (4) 3" x 1¼" hard rubber swivel casters allow for easy portability. The handles allow for convenient positioning and transporting. The overall height is 4-3/8". Specs: overall size 31" x 22" x 4-3/8"; usable size 21" x 21-1/2" x 2"; capacity 840 lbs.