Keyhole router bits are specialized cutting tools used in woodworking to create keyhole-shaped slots or holes in a workpiece. These bits feature a cutting edge with a rounded tip and a spiral-fluted design.

Keyhole router bits are commonly used for hanging wall-mounted items such as picture frames, shelves, or mirrors. They create a narrow, tapered slot with a wider opening at the surface, allowing for easy insertion of screws or nails while providing secure and stable mounting.