Packaging - includes a round rule and five small pencils. (Warm tip: Compasses has 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 draftingSize - 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 rulerGood Performance - A heavy-duty lockable drafting gauge that repeatedly measures or draws arcs and circles, ideal for measuring along the diameter or for precise copyingWidely 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, carpentry, metalworking or leatherworkingNote: The data are all measured manually. Please allow an error of 1-3cm. Due to the difference between light and display, there is a certain color difference, which depends on the actual object received.