Professional Compass Compass Geometry Set with Lock Math and Precision Compass Metal and for Solid and Plane Precis

body { font-size: 100%; color: #000; font-family: Open Sans,Arial,Helvetica,sans-senif,SimSun,""; line-height: 1.3; } dl { margin: 0px; width: 480px; float: left; } dt { width: 100px; height: 15px; float: left; } dd { width: 240px; height: 15px; float: left; } dl dt { margin: 0px; line-height: 22px; color: #474747; font-size: 14px; font-family: tahoma; } #product-desc { width: 100%; height: 209px; } #description { width: 100%; height: 50%; } #details { width: 100%; height: 50%; } .ui-box-title { height: 30px; font-size: 15px; font-family: tahoma; font-weight: bold; background-color: #ddd; text-anchor: inherit; padding-top: 8px; margin: 0px; } .ui-box-body { margin: 0px; } #tbspecifics { border-right: 1px solid black; border-bottom: 1px solid black; } #tbspecifics tr { height: 30px; } #tbspecifics td { width: 100px; border-left: 1px solid black; border-top: 1px solid black; } 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. Stability: The compass with spring bow head and thumbwheel could prevent from unintended slide. colour: blue/black Materials: Metal Package Contents: 1 * Precision Compass 2 * Spare Screws 3 * Spare Lead Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.