The Britool 1/2in Drive 12-point sockets (metric) are crafted from chrome vanadium steel and finished in high chrome. The OGV® profile allows tightening torque to be applied to the sides rather than to the angles of the nut. This product is for manual use only. ISO 2725-1, DIN 3124, ISO 1174-1, ISO 1711-1, ISO 691. Ref: UTTK3502