Sterling Dovetail Ruler DTR5

Sterling Tool Works DTR5 dovetail ruler, for woodworkers without smaller squares. It is designed for popular 12" combination squares and has been tested on several vintage and modern squares, including Starrett, Brown & Sharpe and PEC. It should fit most, though a fit on all cannot be guaranteed.

The rule is a small, hardened, precision-ground blade with a satin chrome finish that clamps into a square in place of the standard rule. It is used to check that dovetails are square, so you can spot problems before they show up as gaps in the assembled joint. The ungraduated end is narrow enough to reach into tight London-style dovetails, where the pins are only a kerf wide and standard rules won't fit. The blade is 2 to 4 times longer than vintage versions, helping with thicker stock or gang-cutting 3/4" and thinner panels.

Dimensions:
Thickness 0.089"
Height 0.445" at the tall end and 0.090" at the small end