Weitlaner Retractor, 3 x 4 Blunt Prongs, 5 1/2" Length, model RS-8612 is manufactured by Roboz Surgical Instrument Co., Inc. A Weitlaner is a self retaining retractor, it is set against the edges of the wound or tissue needed to be kept apart and the ratcheted handles are locked manually while the blades help to keep the tissue apart without requiring further assistance (best for use in shallow incisions).