Metabo HM Core Drill 38x55 mm Weldon Shank 19 mm. This Metabo HM core drill is ideal for precisely drilling holes with a diameter of 14 - 60 mm. It features a Weldon shank with a diameter of 19 mm (3/4"). For larger core drills with a diameter of 70 mm and above, a Weldon shank with a diameter of 32 mm (1 1/4") is used. To achieve optimal results, the core drill should only be used in conjunction with the appropriate centering pin. The Metabo HM core drill is also suitable for drilling in higher alloy steels, making it versatile. Included accessories: centering pin.