Yiyer Professional Woodworking Compass with Wing and Pencil Holder, Large Compass for Geometry, Drawing, Drafting, Perfect Pencil Compass Drawing Tool for Carpenter (90cm/35inch)

The length of the pen can be controlled by adjusting the knob switch. A robust scribing and marking tool. Easy to draw and adjust, lockable heavy-duty drawing compass for repeat measurements or drawing circles and arches, it wont skip or slide out of your control. Ideal drafting compass for workshop, professional all metal compass/divider for woodwork, carpentry, metal work, leather work, math, etc. Draws arcs and circles repetitively with high dimensional accuracy with the lockable wing design. Fast and sturdy, the knurled knob allows for quick, smooth adjustment until it comes into contact with the central collar. The metal tip of the tip can be firmly engraved and does not slip.