Since the time of Euclid, compasses have been used to accurately draw circles and arcs in the practice of geometry, and now this Helix Metal Compass provides a simple way to teach the basics of technical drawing, drafting and geometry in the classroom. Ideal for young students, it comes with a tapered metal point that's less likely to cause injury while still providing a stable pivot point for drawing circles. A screwing cam locks the provided pencil securely in place for accurate drafting. This pack includes 10 metal compasses. Drafting compass for education use Tapered metal point for safer use Screwing cam to lock pencil Sturdy metal legs Plastic grip for drawing circles and arcs Includes half-length pencil Pack of 10