Our brass butt hinges are made from quality brass extrusions, CNC machined. The hinge bore is honed to fit a stainless steel pin. Sizes, 3.5" X 3.5 "plain bearing with 12mm barrel, 4.5" X 4.5" two ball bearing, 14mm barrel. Available with Flat tip. 4.0" x 4.0" plain joint 12mm barrel with Ball tip. These are supplied in Unlacquered Polished Brass. The 4.5" x 4.5" 14mm barrel ball bearing flat tip is also available in Satin Nickel