Features: Made of ABS, easy to by turning the screw. ABS not easy to , durable. Measuring range is 0-180 degree. It can draw circles or arcs with a diameter of 4-30cm. Simple measurement for angle and length. Specifications: Type: angle ruler Material: ABS Color: silver Size: about 30cm Package included: 1pc x angle ruler Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.