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.