An instrument set for screwing an implant into an intervertebral disc space comprises a guide sleeve and a screwing-in instrument. The latter has a shank having a distal end at which the implant can be fixed in a rotationally rigid manner. At the proximal end a rotary handle is fastened in a rotationally rigid manner. The screwing-in instrument further has a residual-advance indicator, which is configured to quantitatively indicate to the surgeon, during the screwing-in procedure, how far the implant is distant in the axial direction from an axial specified position that is fixed relative to the location at which the guide sleeve is supported on the vertebrae.