Math Compass Geometry Set 1pcs Professional Compass Geometry Set with Lock Math and Precision Compass Metal and Durable for Solid and Plane Precis for Drafting and Drawings, Student Supplies

It's also a perfect gift for your kids and friends, easy to take to class and to store in the classroom and at home. Just choose it as school season gift or christmas gift. Precision math compass - made for mathematical geometry and art drawing. unique design to prevent slip while drawing. precise adjustment - the adjustment knob enables students to produce accurate geometric constructions. you can lock the compass in place and have it actually stay when writing. adjustable size - maximum diameter up to 10 inches, minimum for 1/8 inch. you can draw all kinds of circles. all-metal material - made from high quality parts and solid construction, durable enough to last for a long time. three additional leads are easy to replace when needed.