Professional Compass with Lock 10 Inches Diameter Geometry Compass, Drawing Extra Screws and Lead Refills, Tool, Drafting,

【Metal 100%】--There is no plastic in their construction, it is completely made of metal; Lightweight nickel-plated compass high quality ensures you use it for a long time. 【Easy to use】--Whether you are an architect, mathematician, engineer, carpenter and carpenter, student, teacher, artist, it can be easily used with a good adjustment range. 【Precision Compass with Spring Bow Head】--The center wheel has a compass and spring to prevent accidental movement of the legs. 【Adjustment Wheel and Locking Valve】--The compass can be adjusted to prevent accidental leg movement. won't slip out of your hands. Use this compass to draw a perfect circle. 【Bring your own lead core】--no need to find another pencil to use, you can directly use the attached lead core to doodle and draw circles, you will find that the compass is not so cumbersome to use.