While there's a certain charm to the time-honored technique of finding the right size can for marking round corners, this 4-piece template set specializes in quick convenience instead.
One fenced plastic template marks convex corners in 1/4" increments from 1/2" to 2" radii; another covers concave corners in the same sizes. A third marks 45° straight cuts, and finally a large template marks large convex radii from 3" to 6".