Park Tool Double-Ended Cone Wrench
Essential for every home workshop, Park Tool's cone wrenches are strong, affordable, and small enough to carry along for quick roadside repairs.
I get all 3 of them cause that is pretty much all the cone size out there. They works great.
These are very functional (of sufficiently good quality), and offer two sizes per wrench. [Most could get by with one pair of these wrenches.] With the reasonable pricing, you can afford more than one.