Flexible lance for machining or inspecting a tubesheet of a boiler

A flexible lance for machining or inspecting a tubesheet of a boiler, having a first strip comprised of a flexible, metallic material, and a second strip comprised of the flexible, metallic material, wherein the second strip in a longitudinal direction is disposed on the first strip, and wherein at least the second strip is formed so as to comprise a recess, extending in the longitudinal direction, for receiving a supply line for a machining or inspecting head that is disposed on a free end of the flexible lance, and wherein the first strip is connected to the second strip in such a manner that an open side of the recess is covered by the first strip so as to form a guide duct, and wherein at least a peripheral region of the flexible lance, extending in the longitudinal direction, is formed only by the first strip or the second strip, and wherein the first strip and the second strip have dissimilar widths, a width being defined perpendicularly to the longitudinal direction.