Imagine bending the stock of your carpenter’s square so that the tongue sat flat on the workpiece while you held it square to the edge. Now imagine going to the hardware store to buy a new square because you wrecked your old one by bending it. If you had a flexible Japanese square from Lee Valley you wouldn’t be giving your imagination such a workout.
The 3-1/3 oz. stainless steel square is thick and rigid at the corner, but it quickly tapers to a thin and flexible beveled profile on the 20-1/2″ stock and 10-1/2″ tongue. Lee Valley claims it’s square to within 0.1 mm in 100 mm. One side of the square is graduated in inches and the other metric; both sides have numbers etched and filled black.
To buy the Japanese square sold at Lee Valley you’ll pay $33 before shipping. The Japan Woodworker also has a similar, but smaller, square they sell for $40.