This set includes one quick-setting compass with a push-button mechanism and a center wheel, universal adapter and spares box. Both legs are hinged for quick, precise setting. Also includes an interchangeable needle and lead part with 4 mm (0.16") shank. Maximum circle diameter approx. 350 mm (13.78"), with extension bar approx. 585 mm (23.03"). Length 170 mm (6.69"). Comes in a hard plastic case with a hinged lid.