The RS PRO 12 Piece Reversible Ratcheting Spanner Set (8 - 19mm) A hardwearing Reversible Ratcheting Spanner Set suitable for both professional and home use. The ratchet spanner set features 12 dual ended combination spanners with open ended one side and a reversible box ratchet with 72 teeth on the other for a smooth operation in both directions.;Manufactured from a fully hardened and tempered Chrome Vanadium Steel heat treated to 42 - 48 HRC with Molybdenum Steel ratchet gears and pawl for a tough, corrosive resistant build suitable for high torque application;A hard-wearing essential tool for any toolbox covering a wide range of the most common spanner sizes and especially useful for automotive technicians. Features & Benefits 12 piece combination spanner set Tempered and hardened Chrome- Vanadium Steel 72 Teeth ratcheting box head 6° movement on 8 and 9mm 5° movement on 10 to 18mm Meets both ANSI and DIN standards Standards and Approvals: DIN 899, DIN 475 Set Contents: 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm and 19mm Standards and Approvals: DIN 899, DIN 475