Sets of flat polished flat double end ring spanners available in sets of 8 pieces. They are made from chrome-vanadium steel that extends their service life and offers resistance to deformation and high tensile strength. These are double end ring spanners with chrome-plated finish. The set contains 8 different spanners: 6 x 7, 8 x 9, 10 x 11, 12 x 13, 14 x 15, 16 x 17, 18 x 19 and 21 x 23. They have 12 internal walls and rounded points. These are forged spanners with two hex boxes.