Abstract: A device in the form of a split clamp star wheel adapted to be clamped on the spindle carrier extension of a multiple spindle automatic bar machine in a predetermined axial location with respect to the spindle drum face and having at the points of the radiating arms thereof laterally pre-adjusted screws coaxially aligned with the axes of the respective spindles, the holders for the end cutting tools being longitudinally adjustably clamped in the respective end cutting tool slides (or auxiliary slides thereon) when the ends of the respective tools are engaged with the ends of the laterally pre-adjusted screws.