corner bit brace
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1. A strip of material which is fixed across a frame to make it rigid, as a wood strip which is nailed temporarily across the corners of a window frame or doorframe to maintain squareness during shipment or in handling before permanent installation; also called an angle tie.
2. An angle iron.
3. A special brace which is used for drilling where there is insufficient room for an ordinary brace handle to turn.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.