You may be better looking for the degrees of taper. there are certain standardised engineering items, such as taper-pins and Woodruff keys which have standard cutters/drills/reamers/broaches (not to be confused with brooches! ) google / ebay .
As you don't state the length of the cutter-faces, the steepness if the taper is a mystery. It would also help if you stated the application, thus eliminating or confirming a custom-made tool.