Rust prevention is a very real issue, which is exactly what our Tool Guard VCI Emitter addresses. Simply open the emitters, and place them in your toolbox, storage bin, drawers, gun cabinet, or anywhere else you want to prevent rust. One Tool Guard emitter covers two cubic feet of space for an entire year, making rust-prevention as simple and hands-off as possible. These VCI Emitters utilize a corrosion-inhibiting vapor, which fills the space and penetrates everywhere, ensuring every surface is protected against rust and corrosion on a monomolecular level. They also work in humid environments (even 100% RH), without drying anything out. So unlike silica gels and other desiccants, you can confidently use these to prevent rust and/or corrosion on metal surfaces, without harming wood. Even museums use these to protect priceless artifacts imagine how well theyll protect your tools.