The KL dual key bolt interlock is a key operated mechanical bolt interlock suitable for the control of electrical switchgear. The standard unit comes with a 15.88 mm diameter bolt of variable length, that is used to control the rotation or movement of operating handles or toggles of electrical switchgear. Many suppliers of switchgear equipment have mounting kits available for Castell‘s interlocks. The lock is manufactured in brass or stainless steel. The KL bolt interlock is available in a double key or exchange key condition.