SPEED BOW COMPASS & DIVIDER - A durable and economical set that satisfies all introductory level drafting and drawing requirements. Provided in a clear top protective plastic case. Contains a 6½" Speed Bow compass with smooth action rapid adjustment feature, durable cast zinc construction with black fiberglass crown and reinforcements. Features double knee joints for parallel leg positioning and precise drawing of large radii. Makes circles up to 12" diameter. The 6" gearhead divider has adjustable and replaceable needle points. Comes with spare lead.