Forged Chrome Vanadium steel socket with S2 steel bit. Sockets are heat treated and chrome plated with a fully polished mirror finish. Knurled ring for extra grip with oily fingers.M6 1/2Sq Drive Spline Socket Bit• Forged Chrome Vanadium steel socket with S2 steel bit.• Sockets are heat treated and chrome plated with a fully polished mirror finish.• Knurled ring for extra grip with oily fingers.• Lifetime guarantee*.• Model No. SBS011Model No: SBS011:Brand: Premier:Drive: 1/2Sq:Length: 55mm:Nett Weight: 0.065kg:Size: M6:PTDSEASBS011