Sterling Dovetail Ruler DTR2

Sterling Tool Works DTR2 dovetail ruler for Starrett 4" double squares and the small 4" Starrett combination square. It is a cheaper alternative to buying a 2.5" pattern maker's square.

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:
Length 4"
Height 0.300" at the tall end and 0.090" at the small end
Thickness 0.064"