This 12 1/8" diameter flange is comprised of a thin brass ring bolted to a thicker steel ring with outer threads and an inner diameter of 9 1/4. This flange is in good salvaged condition with light surface rust formation throughout the piece. This flange was salvaged from the Mayor J Harold Grady, a 6000 GPM (gallon per minute) fireboat built in 1960, serving Baltimore, Maryland, from 1961 until it was decommissioned in 2007. This fireboat and items from it are featured on Season 10, Episode 8, of the Diy Network show, "Salvage Dawgs". Weight: 18 lbs. Item Measurements: 12(L) x 1.63(W) x 12(H) As seen on Season 10, Episode 8.