Anvil with curved passage for cutting tool

An anvil for a cutting tool, the anvil comprising:

• an anvil body having a curved passage that extends from an inlet opening in the anvil body to an outlet opening in the anvil body, wherein the anvil body includes a top surface, a bottom surface, and a side surface between the top surface and the bottom surface, and a central axis extending between the top surface and the bottom surface;
• the side surface having at least three side surface portions and at least three corner portions, each corner portion of the at least three corner portions being disposed between respective pairs of side surface portions of the at least three side surface portions, at least one corner portion of the at least three corner portions including a surface that extends radially outward and protrudes from a respective pair of side surface portions of the at least three side surface portions, in a direction perpendicular to the central axis, such that in a top view virtual extensions of each of the respective pair of side surface portions are defined by straight lines within a periphery of the surface of the at least one corner portion of the anvil.