Deep offset · Chromium-vanadium steel · Matt chrome plated · With thin-walled rings DIN 838 / ISO 3318 / ISO 1085 / ISO 10104 Further technical information: · Widths across flats: 6 x 7, 8 x 9, 10 x 11, 12 x 13, 14 x 15, 16 x 17, 18 x 19, 20 x 22, 21 x 23, 24 x 27mm