The Trevi Collection by Top Knobs is one of 6 in their Passport Collection inspired by great architectural examples from all around the world. Trevi is patterned after the Fontana di Trevi in Rome, with its breathtaking half dome backdrop. This collection also features a lifetime warranty. In your choice of antique pewter, german bronze, patina rouge, polished nickel or tuscan bronze. 1 1/2" or 2 1/2" boring.