Features Built‑in powerful magnets to fix the extension arm, easy to open and close, not easy to shake or fall off. Made of aluminum alloy material, high strength and corrosion resistance, not easy to wear after long time use. The measuring range is 0‑290mm, and the measuring distance is increased after opening, saving storage space after folding. Adjustable positioning nut helps you freely choose the angle to achieve precise positioning. Can be used as a protractor, a scribe and a triangle square ruler, and is often used in woodwork to make frames, etc. Specification: Item Type: Folding Triangle Square Material: Aluminum alloy Purpose: Used for multi-scene measurement Applicable Scene: Woodworking industry Measuring Range: Approx. 0-290mm / 0-11.4in Package List:1 x Folding Triangle Square Package List 1 x Folding Triangle Square