CK Tools T4343M 21 Combination Spanner 21mm. Hot drop forged chrome vanadium steel, hardened and tempered for strength and durability. Heavy duty chrome plated for corrosion resistance. 12o offset bi-hex ring for access. Manufactured to DIN 3113. Specifications AF Size - Imperial: N/A AF Size - Metric: 21mm Length: 250mm Material: Chrome Vanadium Steel