Overstock Furniture, Finish:Lifetime Brass (PVD) Baldwin's 'S' Door Knocker is forged in solid brass and available in a wide variety of quality finishes; see options to select. Ships with fasteners suitable for 1'-thick door.Base mount diameter: 2'Center-to-center of bolts: 4'Projection: 2'Note: Product finishes which are RELIEVED may vary in luster, hue, and appearance as a result of handcrafted variances in the final finishing step.