The Britool combination spanners (metric) are forged in chrome vanadium steel and have a high chrome finish. The ring spanner end has a 12-point OGV® profile angled at 15°, maximising the contact surface with the nut for a longer lifetime. The open end is angled at 15° from the handle axis. ISO691 - ISO 1711-1 - ISO 3318 - ISO 7738 - DIN 3313.This 18 piece retail pack contains the following sizes: 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and 24 mm. Supplied with a tool roll for easy storage.