There is no faster method for producing multiple mortises than with a template. And the accuracy achieved with a template is unparallel. These mortise bits are specially designed for use with templates, both linear and curved.
If you've ever used a bushing with template work then you'll appreciate these bearing-guided bits; there's no need to calculate offset – ever. Instead, the mortise is sized exactly to the template. And, unlike a bushing on the router sub-base, the guide bearing is always concentric to the cutting circle of the bit. This ensures precise cuts each and every time.