OHTO's Horizon GS01 Needle Point Pen is a classic for a reason.

The aluminum hexagonal barrel tapers into a round tip with a very fine needle point. This pen features a retractable push button and a sleek, shiny barrel. While the point is listed as a 0.7mm, it actually writes much finer thanks to the needle-like tip. Great for precise projects and fine writing! 

Refills available here