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 parts and solid construction, durable enough to last for a long time. Three additional leads are easy to replace when needed.
Stability: The compass with spring bow head and thumbwheel could prevent from unintended slide.

colour: blue
Materials: Metal

Package Contents:
3 x Precision Compass
6 x Spare Screws
9 x Spare Lead