Drill Bit 5/4“ UNC Working length 450 mm / 18" inch _______ RM40 Premium Concrete RML50 Concrete Premium - laser welded RGX50 Concrete Premium - X-Series Dry Drilling Bit Working length 300 mm / 12" inch _______ KT45 • Standard Dry Drill Bit • Laserwelded • Connection 5/4" KT55 • Premium Dry Drill Bit • Galaxis Technology • Laserwelded • Connection 5/4"