NO-RUST SHIELD protects valuable tools against rust and corrosion. 3-IN-ONE No-Rust Shield is an odorless, easy-to-use way to protect your valuable equipment and tools from rust and corrosion. Metal-seeking Vapor Phase Corrosion Inhibitors (VpCI) from the 3-IN-ONE No-Rust Shield migrate through an enclosed space to form an invisible layer that seals metals against air and moisture that can cause rust and corrosion. Protects exposed metal in enclosed spaces without harmful effect on electrical, mechanical or chemical properties. Use in any enclosed space with metals.