This is the COPPER MOUNTAIN HARDWARE Dummy Bolt, an essential accessory for affixing COPPER MOUNTAIN HARDWARE doorknobs to rosettes or backplates in a Dummy Style configuration. To ensure a secure fit, consider utilizing a washer (not included), depending on the knob and rosette combination. Contingent on the specific rosette plate and doorknob pairing, if your door lacks a borehole, consider countersinking for a seamless flush finish. This step ensures a polished and integrated look, enhancing both the functionality and aesthetic appeal of your COPPER MOUNTAIN HARDWARE Dummy Bolt setup. Sold individually.