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You’ll Never Question the Reliability of Our Model 641 and 851 Squares. Designed for woodworking, our new squares deliver the precision woodworkers demand and offer features not found on other squares. For years and generations to come, these will be tools you can trust every time you reach for them. We offer the 641 in a 150mm and 851 in a 200mm metric version that use 1mm scales. All 641 and 851 Squares come in a custom-fitted case. We even mill a notch at the inside corner of the square so you can “zero-out” your layout line all the way to the edge of your work. Easy to read measurement scales are laser etched in 1/16th increments on both sides of the blade. Our Guarantee. We’re so confident in the accuracy of the Model 641 and 851 Squares we offer them with a Lifetime Guarantee to stay square to within .001 inch or we’ll repair or replace it upon return and inspection by us.