This precision double square set is supplied with a traditional graduated rule and an ungraduated dovetailing rule. It is a very versatile tool with many uses. The standard rule provides a wonderful compact square with excellent accuracy rivaling common machinist square accuracies of .001” per inch, per U.S. federal standard: GGG-S-656E. The 4” rule with 4R graduations (8ths, 16ths, 32nds, and 64ths) is precision etched with a satin chrome finish and blackened etches. The excellent contrast makes it easy on your eyes and improves accuracy in use.

The included Sterling Dovetailing Blade is an incredibly handy ruler for checking the squareness of your dovetails. This helps to ensure excellent fit and gap less joints after assembly. The smaller end of the ungraduated rule allows precise checking in even the tightest London style dovetails. Regular size rules simply cannot reach into the spaces the Sterling Dovetailing Ruler can. The Dovetailing Rule is hardened, precision ground and finished with the same satin Chrome finish as the standard rule.

The powder coated square casting provides the accuracy required but avoids the stock-heavy feel of a solid machinist’s square, providing excellent balance and feel. Rules lock securely in any position with the tightening of the knurled thumbscrew.

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