One consideration when designing the layout of a through dovetail is the slope or angle of the pins and tails. While tradition dictates using a dovetail ratio of 1:6 or 9° slope for softwood applications and 1:8 or 7° slope for hardwood, the exact ratio or slope used is largely unimportant, as long as angle extremes are avoided. Some makers prefer the pronounced 14° angle produced by a 1:4 ratio, especially when working in thinner stock, as it not only provides stronger material interlock than traditional ratio angles but produces a slightly exaggerated dovetail joint that many find attractive. The 14° angle is also a close match to that typically found on popular 18th century American period furniture.

Made in Canada, our 14° guides are designed to approximate a 1:4 ratio.