Packaging - Includes a round rule and five small pencils. (Warm tip: Compasses have been polished and the surface is smooth. You can apply a layer of anti-rust oil on the compass scriber pencil to avoid rusting) Materials - Round rules are made of high-quality carbon steel and can be professionally painted. Sturdy for smooth drawing and drafting Size - The size of the drawing pencil round gauge is about 30 cm / 12 inches in length. The pencil compass is large enough to easily draw a circle between 1/2" and 30" in diameter to measure diameter, angle, and drawing of circles/arcs without reusing the ruler Good Performance - A heavy-duty lockable drafting gauge that repeatedly measures or draws arcs and circles, ideal for measuring along the diameter or for precise copying Widely Used - With a lockable wing and pencil holder, widely used for mechanical engraving, leather marking, DIY crafts, etc. Used as a professional carpentry circular rule for carpentry, metalworking, or leatherworking Note: The data are all measured manually. Please allow an error of 1-3 cm. Due to the difference between light and display, there is a certain color difference, which depends on the actual object received.