Multi-purpose dollies are usually a base with four swivel casters attached to the bottom. They are used to help move large heavy objects or to make heavy items and units more mobile. The most common ones are carpeted, which helps protect the finish of items and gives traction to the deck. There are also ones made out of wood which are used for more rugged moves, they are also made out of steel & plastic. Pallet dollies are made specifically for moving and handling pallets, those made for drums are used to help contain and manage drums, and we now offer auto dollies used for moving cars in place in garages and showrooms.