1. Accurate shape reproduction An easier way to reproduce various shapes, ideal for installing tiles, cutting laminate and carpet, ceramic and tool molds, etc. 2. Adjustable and locking function The tightness can be adjusted according to your needs. Especially suitable for drawing the contours of irregular and complex objects. It can be locked and fixed after each adjustment to ensure accuracy. 3. Easy to use Easy to use, push and pull, one-handed adjustment. Hold the pencil in the middle, push it while drawing, and draw lines easily without making mistakes. 4. Both ends can be used Designed with a pulley end and a pointer end, both ends can be used. The drawing on the pulley end is smoother, while the drawing on the pointer end is precise and simple. The pen holder can be moved up and down, changing the shape of both ends easily. 5. High quality and durable It is made of high-quality metal, which is strong and durable. Easy to carry and store, just put it in your tool box and take it with you.