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Micro 100 DC-5 Straight Flute Double End Combined Drill and Countersink 60° Included Angle, 3/16' Drill Diameter, 3/16' Drill Length, 7/16' Shank Diameter, 2.75' Overall Length, Solid Carbide Tool: Industrial & Scientific. Micro 100 DC-5 Straight Flute Double End Combined Drill and Countersink 60° Included Angle, 3/16" Drill Diameter, 3/16" Drill Length, 7/16" Shank Diameter, 2.75" Overall Length, Solid Carbide Tool: Industrial & Scientific. The MICRO 100 DC-5 uncoated solid carbide, straight flute, double ended, combined drill and 60° included countersink tool. Designed and engineered for most machining applications that requires a conical diameter be cut so that it allows for the head of a countersunk bolt/screw to sit flush with the surface of the part being machines. The drill point on this tool allows for a drill to follow with deflection (walking). Tools can be utilized for both roughing and finishing. Each tool's cutting edge/tip has a distinctive mirror like finish that significantly adds to material removal while improving surface finishes. MICRO 100 Solid Carbide Tools feature more than just a micro-grain of excellent quality. Their substrate is in a class of its own resulting from exclusive treating processes that allow for vastly increased speed and feed rates. For over 45 years, MICRO 100 is a known industry leader and internationally acclaimed when it comes to solid carbide tooling. 。 。 。