SWANSON 12" HEAVY GAUGE ALUMINIUM SPEED SQUARE. INCLUDES SWANSON BLUE BOOK. Swanson Speed 4-1/2 In. Aluminum Trim Square. The 90 and 45 are CNC machined to Swanson's precise tolerances. a framing square, try square, mitre square, protractor, saw guide, stair gauge and out-of-square corner angle finder.
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