While you don't "need" a stainless steel tool chest, many amateurs and professionals opt for a stainless steel unit in order to ensure their tool storage method's long-term viability. This is because stainless steel, by its nature, is ultra-resilient and able to resist dents. At the same time, stainless steel surfaces are resistant to corrosion, meaning that rust isn't likely to take hold in workshops where corrosive liquids are routinely handled.