Metric Ratchet Combination Spanners Chrome vanadium steel with mirror polish finish, preventing oil and dirt from adhering to the spanner, making for easier cleaning and preventing corosion. 72-teeth ratcheting system which needs only 5° movement to operate ratchet. Thin wall design for greater access. Head flexes up to 90° in either direction. Conform to ASME B107.6. Chrome plated finish to pevent from corosion. Ring head angle - 15° Open end head angle - 15°