Additional Information:?Precision springbow compass plus precision compass with friction head for precise, smooth radius setting. Hinged leg & needle shoe supports drawing large diameters. Includes divider, extension bar, ruling pen. Spares tube included. Made from metal & distortion free glass-fibre reinforced plastic. Maximum circle 355mm or 433mm with extension arm. Ideal for students, hobby & creative users. Packed in a high quality hard plastic case.