Universal Plastic Locking Compass is a modern, ergonomic compass that's perfect for all ages! It features a twist-lock secures the legs in place for accurate circle size and guaranteed precision. Innovative safety tip automatically retracts when you close the compass legs, to avoid potential injuries in a bag or case. Integrated distance measuring arm is graduated in both inch and metric. Maximum Circle Diameter Created [Max]: 12"; Material(s): Plastic; Color(s): Randomly Assorted; Color Assortment: Blue; Green; Orange; Red.