Abstract: To reduce the production costs for medical instruments (preferably endodontic root canal files) and increase their attractiveness to dentists/doctors, a medical instrument assembly is provided, which is made by metal injection molding and comprises at least two medical instruments (1-6) and a runner (7a, 7b) that interconnects said at least two medical instruments (1-6) and is formed integrally therewith. Each of the at least two medical instruments (1-6) have a grip portion (13-15; 23-25) at a distal end that offers a grip for a hand or a tool such as a dental hand-piece, and each of the medical instruments (1-6) is removable from the runner (7a, 7b) by breaking it away from the runner (7a, 7b), irrespective of an adjacent medical instrument. The medical instruments may be of the same or of different size, may be disposable, and the assembly preferably is sterile and contained in a closed sterile package.