Core Drill Bit Arbor Adapter, 5/8"-11 Thread To 3/8" Hex Shank For Threaded ?Size --1pc 5/8"-11 Thread to 3/8" Hexagon Shank, total length 53MM, shank length 28MM ?Made of strong hardness Alloy steel metal, heat treatment, high strength, Surface Nickel plating,Twist Resistant Alloy to ensure long service life ?Use your diamond core bits or diamond hole saw for grinder with standard drill by this 5/8-11 arbor shaft adapter ?This arbor adapter will transform your 5/8?-11 female arbor to a regular 3/8? tri-angle (easy to grab) shank. You will be able to use your standard drill (electric or charged) ?This 5/8-11 core bit adapter for Standard Drill Use For marble polishing kit, polishing wheel for drill, sanding drill bit , and sanding wheel for drill or polishing wheel for drill