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.

Center drills consist of a pilot drill and a countersink and are used to create holes at the center of a piece of stock so it can be turned between centers on a lathe. The pilot drill creates a small hole in the stock and the countersink expands the hole, leaving a small gap at the bottom of the hole that helps protect the lathe's centers from damage when the stock is turned on it. These sets contain multiple center drills in a range of sizes.

Drill bit countersinks can drill and countersink a hole in one step for maximum productivity. They produce a chamfered hole with a tapered opening that allows screws to install flush with the surface of the workpiece for a finished look. These sets contain multiple drill bit countersinks in a range of sizes.

Spotting drills create starter holes that help prevent drill bits from walking (or moving) when the hole is drilled deeper with a drill bit. Also known as hole-starting drill bits or spot drills, these short drill bits have a rigid shank that helps ensure the starter hole is accurate and has clean sides. These sets contain multiple spotting drills in a range of sizes.