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Dollies are wheeled platforms placed under large objects, allowing it to be moved or transferred from one place to another. These platforms usually have holes or slots on the sides for attaching rigging slings to securely fasten the load or by a rope for pulling. Trolleys or hand trucks may come as two-wheeled or as four-wheeled platform variants. Two-wheeled hand trucks or sack trucks consist of a wheeled frame with a beveled nose that is inserted under a flat-bottomed cargo to be lifted and moved. Their frame supports the weight of the load and is moved in a slightly slanted position. Platform trucks, on the other hand, have a larger surface area to accommodate larger loads carried in an upright position. Hydraulic jacks are mechanical devices that use screw threads for lifting heavy objects.