Angle Measurement Tool:2 in 1 with our clever idea of converging goniometer and ruler into a double graduation from 0 to 180 degrees, measuring lengths from 0 to 15 centimeters.Protractor material: Polished stainless steel, brass lock nut. High quality stainless steel material resistant to durable work. Exquisite.Professional tool for drawing or measuring angles or lines.For drawing radial lines, setting bevels and transmitting angles.Adjust the suction cup by loosening the screw. Used to draw radial lines, tilt and translate anglesProtractor ruler alarm and dial head can be disassembled; perfect for school, business, home, mechanical work, woodworking, etc. Product description The angle protractor is made of sturdy stainless steel, permanently engraved, durable and long-lasting. Double division of 0-180 and 180-0 bidirectional mark and scale mark on the bottom edge of the semi dial head -circular. This protractor ruler has an adjustable 150mm straight ruler, which can be held in position with the knurled lock nut and can detect angles quickly and easily. The ruler protractor is suitable chamfering, drawing radial lines, measuring and marking angles. The protractor ruler alarm and dial head can be disassembled; perfect for school, business, home, mechanical work, woodworking, etc. specifications: Material: stainless steel Measurement: Double graduation of 0-180 & 180-0 degrees in two directions; 150mm / 6" Protractor Ruler Use: Adjust the bevel, draw radial lines, measure and mark angles Applications: school, commercial, household, mechanical and woodworking applications, etc. Size: 150mm, rotation 0-180 degrees Package includes: 1 Protractor, 0-150mm