Dual-action legs fold for safe and compact storage, and patented Stop System locks legs into position for use. Maximum circle diameter of 14". Adjustable knee joints allow for precise circles and fold in for safety. Comes in a shatterproof storage case. Set includes: Maped Technic Compass, universal holder, 0.5mm mechanical pencil, lead sharpener, pack of leads, graphite pencil, & extension arm.