Things changed when dovetail jigs first arrived on the scene. The first dovetail jigs were limited to evenly spaced, half-blind dovetails with equally sized pins and tails. Many of these early jigs were designed to work with a 14° bit. This steeper angle certainly makes for a strong joint. But it also brands the joint as machine cut. As dovetail jigs became more sophisticated, companies like Leigh worked to create a way to vary the spacing of the pins and tails. But even with this innovation in dovetail jigs, the assembled dovetails still displayed the machine-cut look, just spaced differently. To give a more “handcut” look to the finished joint, at least one dovetail jig (WoodRat) uses bits that more closely match the slope of handcut dovetails. Which is why you may find bits designated by slope ratio as well as angles.