The production of these knobs is a meticulous process that starts from brass bars. These bars are hot forged, sheared and subjected to machining, grinding, vibrating, polishing, galvanic deposition and PVD coating, all followed by a distinctive laser marking. The final result is a wide range of central knobs for fixed and revolving doors, available in various shapes and finishes, which adapt perfectly to your environment, be it modern, contemporary or classic. In addition to aesthetics, Olivari knobs are synonymous with of safety and reliability. Each stage of production is subjected to rigorous quality controls to ensure maximum reliability. The range of Gold, Nickel and Stainless Superfinishes offer an exceptional 30 year guarantee when installed and maintained correctly, whilst the Anthracite, Bronze and Copper Superfinishes are covered by a 10 year guarantee. The galvanic polished chrome and satin chrome finishes also enjoy a 10-year guarantee. In short, Olivari door knobs are not just design accessories, but demonstrate a constant commitment to quality, safety and aesthetics, contributing to transform your doors into functional works of art that stand the test of time.