This shape of bail hanging from a small back plate is often referred to as,Colonial Revival hardware. The heavy brass bails hang from a stout post,and back plate (one piece). The pulls are fastened with a furniture screw,from the backside of the drawer. The drop measures 1 3/4 inches. , ,We have not cleaned these. See care of cast brass hardware in the glossary. ,This is a very fine old pair. Screws included.