Version: DIN 838, ISO 3318, made from GEDORE vanadium steel 31CrV3. Rings thin-walled with UnitDrive profile, polished, width across flats: 21 x 24 mm, length: 307 mm, ring thickness a1: 13.4 mm, ring thickness: 14.4 mm
Double ended ring spanner offset 7x8 mm * not standardised