A handle for casing, comprising a wing movable with respect to a fixed frame and defining a horizontal axis lying on the plane of the wing, said handle determining the engagement or the disengagement of said wing with said frame in order to obtain said casing closing or opening, said handle comprising: - a handle rod rotatably associated to said movable wing according to a first rotation axis perpendicular to said horizontal axis and to the plane defined by said movable wing, said handle being rotatable between a closed position wherein it assumes a position with zero inclination with respect to a vertical axis perpendicular to said sliding axes and rotation, and an open position in which it assumes a position inclined with respect to said vertical axis with angle of inclination equal to a; - an operating pin driven by said handle rod and suitable for actuating in engagement or disengagement a lock mechanism of said wing on said fixed frame, said operating pin being rotatable with respect to its own axis of rotation (Z') of an angle β where at zero rotation corresponds the engagement movement of said lock mechanism and to the rotation of value β corresponds to the disengaging movement of said lock mechanism, in which β is greater than a; - multiplier gear means to connect operationally said handle to said operating pin so that when said handle rotates of a, said operating pin rotates of β; said handle being characterized in that: - said rotation axis (Z') of said operating pin and said rotation axis of said handle are aligned; - said multiplier gear means comprise an inlet element integrally connected with said handle, an output element integrally connected with said operating pin and a multiplier element which engages simultaneously with both said input and output elements and is rotatable about a second rotation axis (Z") parallel to said rotation axis (Z = Z') and spaced with respect to it along said vertical axis. - a handle rod rotatably associated to said movable wing according to a first rotation axis perpendicular to said horizontal axis and to the plane defined by said movable wing, said handle being rotatable between a closed position wherein it assumes a position with zero inclination with respect to a vertical axis perpendicular to said sliding axes and rotation, and an open position in which it assumes a position inclined with respect to said vertical axis with angle of inclination equal to a; - an operating pin driven by said handle rod and suitable for actuating in engagement or disengagement a lock mechanism of said wing on said fixed frame, said operating pin being rotatable with respect to its own axis of rotation (Z') of an angle β where at zero rotation corresponds the engagement movement of said lock mechanism and to the rotation of value β corresponds to the disengaging movement of said lock mechanism, in which β is greater than a; - multiplier gear means to connect operationally said handle to said operating pin so that when said handle rotates of a, said operating pin rotates of β; said handle being characterized in that: - said rotation axis (Z') of said operating pin and said rotation axis of said handle are aligned; - said multiplier gear means comprise an inlet element integrally connected with said handle, an output element integrally connected with said operating pin and a multiplier element which engages simultaneously with both said input and output elements and is rotatable about a second rotation axis (Z") parallel to said rotation axis (Z = Z') and spaced with respect to it along said vertical axis.