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+1 (217) 579-8045Interchangeable pilot-counterbore body with 3-flutes, diameter 9/32" with an overall length of 3.13/16" and a flute length of 3/4" and 17/64" straight shank, according to ANSI standard to produce a flat bottom seat for socket-head cap screws with the aid of a pilot with a shank diameter of 3/32" and a maximum pilot guide diameter of 7/32", HSS with standard bright finish for machining free machining and plain carbon steel, wrought and copper or copper alloys.