Features Fitment — Perfectly fits 1 inch Hardy hole of an anvil, or can be used in a vise. Simply insert it into the anvils’ hardy hole vertically and you can start your forging jobs. Function — Used for hammering barstock into perfect conical rings or scroll shapes. It has a purpose similar to the round horn on an anvil but more consistent round shapes can be created with the help of this tool. Design — This mandrel is smooth on all sides and does not contain a “tong” groove. Square shanks fit the square hole in the anvil and prevent rotation. .