A dose setting mechanism intended to be used in a medicament delivery device, comprising: - an elongated tubular distal housing having opposite distal and proximal ends, wherein said distal housing comprises: - threads on its inner surface, - a first window, a second window and at least one opening on its elongated surface; - a tubular dose limiting member having opposite distal and proximal ends, wherein said dose limiting member comprises: - a first thread segment on its outer circumference surface at its proximal end intended to cooperate with corresponding threads on the inner surface of the distal housing, - first indicia on its outer circumferential surface, - a stop surface at its proximal end, and - a number of protrusions arranged equidistant to each other along the circumference on the outer surface at its distal end, - wherein the dose limiting member is arranged to be manually rotatable via the at least one opening; - a tubular dose setting member having opposite distal and proximal ends, wherein said dose setting member is coaxially arranged inside the dose limiting member and comprises: - a second thread segment having and end surface on its outer circumferential surface at its proximal end intended to cooperate with the threads of the distal housing, wherein the stop surface is configured to abut against the end surface for limiting a foremost proximal position; - second indicia on its outer circumferential, and - a dose setting knob protruding through the distal end of the distal housing; and - a removable lock member attached to the distal housing and arranged to be positioned over the at least one opening, wherein said lock member comprises at least one elongated rib on its inner circumferential surface which is intended to interact with the protrusions of the dose limiting member for locking the dose limiting member in a certain position when the lock member is attached to the distal housing. - an elongated tubular distal housing having opposite distal and proximal ends, wherein said distal housing comprises: - threads on its inner surface, - a first window, a second window and at least one opening on its elongated surface; - threads on its inner surface, - a first window, a second window and at least one opening on its elongated surface; - a tubular dose limiting member having opposite distal and proximal ends, wherein said dose limiting member comprises: - a first thread segment on its outer circumference surface at its proximal end intended to cooperate with corresponding threads on the inner surface of the distal housing, - first indicia on its outer circumferential surface, - a stop surface at its proximal end, and - a number of protrusions arranged equidistant to each other along the circumference on the outer surface at its distal end, - wherein the dose limiting member is arranged to be manually rotatable via the at least one opening; - a first thread segment on its outer circumference surface at its proximal end intended to cooperate with corresponding threads on the inner surface of the distal housing, - first indicia on its outer circumferential surface, - a stop surface at its proximal end, and - a number of protrusions arranged equidistant to each other along the circumference on the outer surface at its distal end, - wherein the dose limiting member is arranged to be manually rotatable via the at least one opening; - a tubular dose setting member having opposite distal and proximal ends, wherein said dose setting member is coaxially arranged inside the dose limiting member and comprises: - a second thread segment having and end surface on its outer circumferential surface at its proximal end intended to cooperate with the threads of the distal housing, wherein the stop surface is configured to abut against the end surface for limiting a foremost proximal position; - second indicia on its outer circumferential, and - a dose setting knob protruding through the distal end of the distal housing; and - a second thread segment having and end surface on its outer circumferential surface at its proximal end intended to cooperate with the threads of the distal housing, wherein the stop surface is configured to abut against the end surface for limiting a foremost proximal position; - second indicia on its outer circumferential, and - a dose setting knob protruding through the distal end of the distal housing; and - a removable lock member attached to the distal housing and arranged to be positioned over the at least one opening, wherein said lock member comprises at least one elongated rib on its inner circumferential surface which is intended to interact with the protrusions of the dose limiting member for locking the dose limiting member in a certain position when the lock member is attached to the distal housing.