Special highlight: • Suitable for heavy duty use • Longer durable • Perfect for school, commercial, or home in machinist, woodworking, and homework applications. • Deeply etched graduations read from 0° to 180° in forward and reverse directions and will not wear or rub off. • Used the tool for setting bevels and measuring and marking angles. • The protractors are made of high-quality stainless steel material, not easy to rust, smooth edge, accurate measurement.