flat type
V-type
dovetail type
any one of these
internal screw threads
external screw threads
no threads
tapered threads
internal taper
external taper
internal and external taper
no taper
arithmetical progression
geometrical progression
harmonical progression
beveling the extreme end of a work piece
embossing a diamond shaped pattern on the surface of a work piece
reducing the diameter of a work piece over a very narrow surface
enlarging the end of a hole cylindrically