This is the Gundlach AST-30 Adjustable Aluminum Straight Edge. The AST-30 is 19-3/4" long and opens up to a max length of up to 37" long. This straight edge has 5/16" thick members that have partially beveled edges. Adjustments can be made by simply loosening and tightening a knob head screw. Adjustable lengths can be locked into position using the knob head screw.
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