Features: The Profiles scribe tool is make of aluminium Alloys with steel roller bearing, and the length is extended to 300mm, making it more widely used. Pulley and pointers designs for both ends. Drawing is smooth on the pulley side and easy and more accurate on the pointers side. Pen holder can be moved up and down for easy change of modelling end. It can be locked and fixed after each adjustment to ensure accuracy. Looseness and tightness can be adjusted according to your needs. Our Profiles gauges is especially suitable for drawing the Profiles of irregularly and complex objects. Easy to Use: Adjustable with single hand. Fix the pencil in the centre and draw as you push. Easy to draw lines without mistake. Specifications: Materials: Aluminum Alloys Size: about 300x30mm/11.81x1.18inch Package Includes: 1Pc Profiles Scribing Ruler note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.