Double Bevel - (From Wikipedia) A back bevel, similar to a sabre or flat grind, is put on the blade behind the edge bevel (the bevel which is the foremost cutting surface). This back bevel keeps the section of blade behind the edge thinner which improves cutting ability. Being less acute at the edge than a single bevel, sharpness is sacrificed for resilience: such a grind is much less prone to chipping or rolling than a single bevel blade. In practice, double bevels are common in a variety of edge angles and back bevel angles.' A double bevel is depicted in the image below:
To create a double bevel using the Wicked Edge®, it's easiest to create the back bevel first and then the edge bevel. Start by selecting the angle of the back bevel and working both sides of the blade until the back bevel reaches the edge. Progress through the stones to polish the blade as much as possible. Then move the collars out to the desired angle for your edge bevel. You can start with the 600 grit fine stones or even the 800 grit extra-fine stones. The edge bevel does not need to be large in order to be effective at improving durability.