Chrome vanadium steel 12sq drive standard and deep walldrive sockets and drive components hardened and tempered for strength and with a fully polished chrome finish for corrosion resistance socket sizes 8 9 10 11 12 13 14 15 16 17 18 19 21 22 24 27 30 32mm in both standard and deep sockets for 10 14mm spark plugs ratchet wrench three extension bars breaker bar t handle driver and universal joint supplied in robust carry case