Our antique 'Octagonal Rim Door Knob' is cast from high quality iron material, giving it durability, style, and an easy assembly. Protected with a high density zinc rich undercoat to increase durability, with a UV colour fast black powder coated finish with a stainless steel inner mechanism for increased endurance. The clean Octagonal shape for a comfortable grip which blends well with any traditional decor. It maintains great flexibility, as it can be used as a mortice knob since it's unsprung and comes in pairs. Octagonal Door Knob Specifications: · Material: Wrought Iron · Knob Diameter: 56mm · Rose Diameter: 60mm · Projection: 56mm