A trigger assembly for use with an electrical device, said trigger assembly including a main body having an electric switch housing within which an electrical switch unit is disposed therein, a trigger member having an engagement portion that is hingedly connected to the main body of the trigger assembly so that the trigger member is rotatable about a hinge relative to the main body, said trigger member also including a first wall and sidewalls defining a trigger member space therebetween; an actuator member operably-connected to the trigger member wherein, responsive to rotational movement of the trigger member about the hinge relative to the housing, said actuator member is movable in a first direction relative to the housing from an OFF position in which an electrical switch of the electrical device is operably-opened by the actuator towards an ON position in which the electrical switch is operably-closed by the actuator, and is movable in a second direction relative to the housing from the ON position towards the OFF position; and a lock-off mechanism including a lock-off member that is selectably operable to restrict movement of the trigger member towards the main body and to thereby restrict movement of the actuator member from the OFF position into the ON position, and, to not restrict movement of the trigger member toward the main body and to thereby allow movement of the actuator from the OFF position in to the ON position; characterised in that the main body includes at least one rigid arm (121A, 121B) having a first end connected with a surface of the main body and extending away from the main body into the trigger member space terminating at a second end that is spaced apart from the first end, and wherein, said lock-off member is rotatably mounted proximate to the second end of the at least one rigid arm; and wherein the trigger member includes an aperture disposed therein and is configured so that a user may rotatably operate the lock-off member about the second end of the arm via the aperture in the trigger member. for use with an electrical device, said trigger assembly including a main body having an electric switch housing within which an electrical switch unit is disposed therein, a trigger member having an engagement portion that is hingedly connected to the main body of the trigger assembly so that the trigger member is rotatable about a hinge relative to the main body, said trigger member also including a first wall and sidewalls defining a trigger member space therebetween; an actuator member operably-connected to the trigger member wherein, responsive to rotational movement of the trigger member about the hinge relative to the housing, said actuator member is movable in a first direction relative to the housing from an OFF position in which an electrical switch of the electrical device is operably-opened by the actuator towards an ON position in which the electrical switch is operably-closed by the actuator, and is movable in a second direction relative to the housing from the ON position towards the OFF position; and a lock-off mechanism including a lock-off member that is selectably operable to restrict movement of the trigger member towards the main body and to thereby restrict movement of the actuator member from the OFF position into the ON position, and, to not restrict movement of the trigger member toward the main body and to thereby allow movement of the actuator from the OFF position in to the ON position; characterised in that the main body includes at least one rigid arm (121A, 121B) having a first end connected with a surface of the main body and extending away from the main body into the trigger member space terminating at a second end that is spaced apart from the first end, and wherein, said lock-off member is rotatably mounted proximate to the second end of the at least one rigid arm; and wherein the trigger member includes an aperture disposed therein and is configured so that a user may rotatably operate the lock-off member about the second end of the arm via the aperture in the trigger member.