ADJUSTABLE TRIANGLE- This drafting triangle is made out of high quality acrylic plastic for a tough, rugged design. With an aluminum hinge point and thumb screw, this triangle will never let you down. The clear acrylic body also lets you see what is under it; so you never make a wrong mark again. With beveled inking edges, there has never been a better choice for drafting triangles. VERSATILE AND EASY TO READ- Easily adjustable along the aluminum hinge point, never make a wrong measurement with its easily readable scale degrees. With scale degrees in rise (12), seconds, and degrees; always be ready for every type of situation. The magnified scale reader makes sure you get the perfect scale degree. RELIABLY PRECISE- This drafting triangle will make sure you get the perfect angle for all your projects. The die-engraved graduations make is easy to see and accurate every time. The thumb screw also adds the ability to lock down the triangle to the angle you need. never worry about movement or instability when marking your project. THE PERFECT GIFT - Gift this adjustable angle triangle to the artist in your life. Give them a practical, memorable gift that will take their creativity to the next level. Made out of high quality acrylic plastic featuring an inking edge compatible with all writing utensils. Available in 8," 10," or 12" Beveled inking edges Clear acrylic Marked with rise in tangent, seconds, and degrees