Surgical steel screw tip surgical steel due to the simple design - very versatile easy to sterilize the material used guarantees very high color fastness and material resistance Best suited for allergy sufferers (anti-allergic material) with high-quality PVD coating (abrasion-resistant coating) PVD = Physical Vapour Deposition (vacuum-based coating process) The starting material is converted into the gas phase with the aid of physical processes. The gaseous material is then passed to the substrate to be coated, where it condenses and forms the target layer.