A steering tool (10, 200) comprising: an internal tube disposed inside an external tube, said internal and external tubes (12, 14) being arranged for longitudinal axial movement relative to one another, wherein a distal end of said internal tube is fixedly joined to a distal end of said external tube, and at least one of said internal and external tubes (12, 14) is formed with transverse slots near the distal end thereof, and wherein the longitudinal axial movement causes bending of the distal ends of said tubes; wherein said internal and external tubes (12, 14) are held in internal and external tube holders (218, 204; 22, 24), respectively, which are mounted in a manipulation handle (20, 202), and wherein said internal and external tube holders (218, 204; 22, 24) are movable axially with respect to one another along their longitudinal axes to cause bending of the distal ends of said tubes, and wherein said internal and external tube holders (218, 204; 22, 24) are rotatable with respect to one another around their longitudinal axes; wherein said handle is provided with a tube manipulator for causing relative axial movement of said internal and external tubes (12, 14), wherein said tube manipulator abuts against or is connected to a movable portion of said handle, which is connected to or abuts against said external tube holder, and wherein said tube manipulator is arranged to abut proximally against a stationary portion of said handle, characterised in that said tube manipulator is configured to selectively interact with a groove formed in said handle, wherein said groove is adapted to serve as a proximal stop in said handle and lock said tube manipulator in place. an internal tube disposed inside an external tube, said internal and external tubes (12, 14) being arranged for longitudinal axial movement relative to one another, wherein a distal end of said internal tube is fixedly joined to a distal end of said external tube, and at least one of said internal and external tubes (12, 14) is formed with transverse slots near the distal end thereof, and wherein the longitudinal axial movement causes bending of the distal ends of said tubes; wherein said internal and external tubes (12, 14) are held in internal and external tube holders (218, 204; 22, 24), respectively, which are mounted in a manipulation handle (20, 202), and wherein said internal and external tube holders (218, 204; 22, 24) are movable axially with respect to one another along their longitudinal axes to cause bending of the distal ends of said tubes, and wherein said internal and external tube holders (218, 204; 22, 24) are rotatable with respect to one another around their longitudinal axes; wherein said handle is provided with a tube manipulator for causing relative axial movement of said internal and external tubes (12, 14), wherein said tube manipulator abuts against or is connected to a movable portion of said handle, which is connected to or abuts against said external tube holder, and wherein said tube manipulator is arranged to abut proximally against a stationary portion of said handle, characterised in that said tube manipulator is configured to selectively interact with a groove formed in said handle, wherein said groove is adapted to serve as a proximal stop in said handle and lock said tube manipulator in place.