Corrosion-resistant steel. Includes tommy bar. Spanner sizes: 8 x 9mm, 10 x 11mm, 12 x 13mm, 14 x 15mm, 16 x 17mm and 18 x 19mm. Corrosion-resistant steel. Includes tommy bar. Spanner sizes: 8 x 9mm, 10 x 11mm, 12 x 13mm, 14 x 15mm, 16 x 17mm and 18 x 19mm.