Mechanical Gear Ruling Pen for Precision Drafting

This professional-grade ruling pen features a mechanical gear adjustment mechanism with toothed wheels and screw-fastened joints for calibrating line widths with fine accuracy. It is constructed from metal with a polished reflective finish. Weighing 66 g, it has a compact curved body measuring 9.5 x 12 with a 3 by 3 gear component. Designed for design professionals and model makers, it delivers consistent straight lines for technical drafting and model planning.