What is the difference between a gravity scalpel and an OTF scalpel? This 2026 guide compares their deployment, mechanics, and legality. While OTF scalpel knives offer snappy, mechanical slider deployment for fast one-handed use, gravity models rely on inertia. As a premier custom CNC machined titanium OTF scalpel factory, we provide high-quality wholesale EDC utility knives and OEM/ODM services for replaceable blade OTF knives compatible with standard #11 surgical blades for global brands.