Countersink Set, 120 Degrees , 7, High Speed Steel, Bright (Uncoated) Countersinks expand the top of an existing hole in a workpiece to ensure screws install flush with the surface of the workpiece. This can prevent the workpiece material from swelling when a screw is installed in the hole and tightened down. They can also be used to debur holes for a smooth finish. These sets contain multiple countersinks in a range of sizes.Countersink and center drill sets contain multiple tools in a range of sizes. They eliminate the hassle of buying individual tools separately and are ideal for job sites that frequently use many different sizes of tools in metalworking tasks.
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