National Hardware's satin nickel door knockers in the Powell Collection are designed to let others know you have arrived at the front door. Available in matte black, satin nickel or brushed gold. Instructions and mounting hardware included for installation. Surface-mounted application for easy DIY installation. Add a touch of style to your entryway. Finish matched to National Hardware's door hardware line for a clean, modern look. National Hardware's Lifespan Limited Lifetime Warranty