Often called step drill bits, these drill and counterbore holes at the same time. After drilling and counterboring, tap the hole and install your fastener. The body diameter may decrease after multiple sharpenings.

Also known as multi-spur counterbores, these have two set screws to secure them to a woodworking drill bit (sold separately). Lock the counterbore into position on the drill bit with the two set screws.

Attach one of these counterbores to a standard jobbers’ or brad-point drill bit (sold separately) to convert it into a counterboring drill bit. Lock the counterbore into position on the drill bit with the two set screws.

Optional collar (not included) controls the cutting depth of your counterbore. It attaches with two set screws.

These counterbores are attached to a drill bit for drilling and counterboring in a single step. Use them to create flat bottomed holes that act as seats for the heads of lag screws, washer head screws, and tee nuts. All have a 1/4" hex shank that fits quick-change drill chucks, power screwdrivers, and impact drivers. Lock the drill bit in place with the included set screw. For tough resistance to wear, corrosion, and heat, the drill bit is titanium nitride (TiN) coated.

Use the optional rotating depth stops to drill holes to a precise depth. The end of the collar has a ring that rotates separately from the body. When the ring touches your workpiece, it stops moving to prevent scratches or rub marks. The wide opening leaves room for chips to clear the drilling area.