Solid bronze architectural grade hinges with stainless steel hinge pin in a true oil rubbed bronze finish (an oil rubbed bronze finish on a solid bronze hinge is far superior to an oil rubbed bronze finish on a solid brass hinge). In addition, solid bronze does not corrode as brass sometimes will in severe conditions. Bronze also has the advantage of being self-lubricating. This quality reduces wear on the hinge and provides a hinge that does not squeak. Architectural grade butt hinges are thicker and of much higher quality than Residential Grade butt hinges. The 3-1/2"x3-1/2" and 4-1/2"x4" hinges include wood screws. The 4"x4" and 4-1/2"x4-1/2" hinges include wood screws and machine screws. Optional Accesories: Decorative ball tips can be added to this hinge if desired. See the link below to purchase the decorative ball tip conversion kits