Cast aluminum machine holder with two stable guide pillars, additional handle, 2 continuously adjustable depth stops, 2 spiral springs for the return stroke of the machine, precise drilling at exactly 90 ° angle (rigid version), (swiveling version) continuously swiveling up to 45 °, including rotatable drill bushing plate, for drills ø 8, 10, 12, 14, 16, 18, 20, 22, 24, 26 mm and drills with 43 mm Euro neck