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A counterbore is a necessary tool to make a a cylindrical flat-bottomed hole, which enlarges another hole, or is used to create that feature. Counterbores are  made with standard dimensions for a certain size of screw and the tip of the tool is called the pilot. Smaller-diameter hole has been drilled to the standard diameter for the particular screw size, the pilot will fit the hole which  help to provide rigidity and hole center location.

Product Name	Photo	Description
HSS Flat Counterbores DIN373
HSS Taper Shank Flat Counterbores DIN374
HSS Socket Cap Screw Counterbores
HSS interchangeable counterbores set

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