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A small piece of scrap lumber or shingle, usually wedge shaped, which when forced behind a furring strip or framing member forces it into position. Also used when installing doors and placed between the door jamb legs and 2 X 4 door trimmers. Metal shims are wafer 1 1/2″ X 2″ sheet metal of various thickness’ used to fill gaps in wood framing members, especially at bearing point locations.