Screwer Dominator Urethral Grooving SoundWhen you want something more advanced than the standard medical sounds, DOMINATOR is there for you. Hefty and damn' HOT. - Length 178 mm (7 inch approximately). - Minimal diameter 6 mm - Maximal diameter 10 mmThis product is certified 100% Non-Magnate and medical-grade steel. Beware of cheaper products that are not solid surgical steel but chromed steel or poor quality surgical steel that contains Magnate. Magnate is the ingredient that makes steel rust. We will only include this endorsement on our 100% surgical steel products.