The 3-1/2 in. x 5/8 in. Radius Black Butt Marker is used to mark the placement (size and depth) of the hinge, a chisel is still needed to remove excess wood from the door and jamb.
The distance from the stops to the cutting edge is 1.18 inches.
It does have a radius for rounded hinges
If you notice the 5/8" radius and the square styles cover a majority of hinges. Any other style would need to be purchased from a specialty supplier.