Designed to give screw heads a slightly loose fit, these counterbores are a bit wider than standard sizes. The extra clearance prevents binding and leaves room for a seal or O-ring around the screw head.

Skip a step when installing screws in metal. With a sharp point on the tip, these counterbores drill a pilot hole topped with a flat recess for the screw head. That's faster and more accurate than switching to a counterbore in between passes with your drill bit.

Pair these counterbores with an insert (sold separately) to cut hundreds of precise holes with the same tool. When the cutting edges dull, replace the insert instead of the counterbore to reduce costs during high-volume jobs. Secure the insert with the included screw so it stays in place, even at the high speeds of your CNC machine. These counterbores create flat-bottomed holes that allow socket head screws to sit flush with your surface.

A pilot centers these counterbores and prevents wobbling for an accurate cut on the first try. With dimensions that match standard screw-head diameters and thread diameters, they are your plug-and-play option for pilot-driven counterbores.

Metric counterbores have undersized pilots to meet DIN standards.