Angle Ruler: This construction protractor features both length and angle measurement functions. With an adjustable thumb nut, it allows for secure positioning and easy measurement from 0 to 180 degrees. The clear, accurate scale enables precise readings. It can measure lengths up to 30 cm (0-12 inches), making it a practical tool for individuals working in carpentry, construction, and engineering.Adjustable Protractor Arm: The protractor includes center positioning and scribing capabilities. The adjustable arm, secured by a knurled nut, locks into place for accurate angle identification, bevel setting, and drawing straight lines. This design supports precise measurements and markings for various applications.High Quality Protractor: Constructed from aluminum alloy with laser-engraved markings, this ruler ensures durability and clear readability. At 2 millimeters thick, it is sturdy and well-built. Ideal for those seeking a reliable and accurate angle measuring tool for home or professional use.Multipurpose Use: Suitable for engineering, angle measurement, architectural design, student drawing, and length measurement. A versatile tool for craftsmen, designers, artists, and engineers.Specifications: - Ruler measuring length: 0-30 cm - Protractor measuring range: 0-180 degrees - Size: 304 mm x 100 mm - Material: Aluminum alloy - Color: Black + silver Package Contents: 1 x Protractor Angle Ruler Note: Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.