Widely Used；Adjustable compasses are suitable for woodworking, decoration design and industrial drawing. Adjustable Length；The length can be adjusted according to the required radius, which is suitable for various circle drawing needs. Circle Fixed Pen；The fixed pen is screwed into the tail of the compass for easy storage. Take out the fixed pen, put it in the centerline hole of the compass, and fix it on the wooden board for use. Solid Aluminum；The circle compass is made of aluminum alloy, wear-resistant and anti-rust,strong stability and is not easy to break. Portable：The circle drawing tool can be stretched and retracted, easy to carry.