These centers for the drill press are for quickly locating a hole in your part.
Not as precise as other methods but quick and accurate enough for a lot of parts.
Each center has a 50 degree included angle. However these are made so
they can be used on thin or thick parts.
Each one has one end shortened so larger holes can be indexed in thin parts
where the pointed end would bottom out.
Pointed ends can be used to index holes in thick parts or pickup scribed layout lines.
I made 5 sizes but the sky is the limit.
All are made from short cutoffs of drill rod but not hardened.
I don't think that would be necessary for the intended use.