Pololu's #4-40, 3/8" length, Phillips pan-head screw is an essential component for any project. It's a sturdy, zinc-plated steel screw that measures 9.5mm in length. Each pack comes with 25 screws, making it perfect for larger projects or for keeping a handy stash for future use. These screws are incredibly versatile and can be used in a range of applications. Whether you're assembling a robot, securing a circuit board, or working on a DIY project, these screws provide the necessary grip and stability. They're designed to work seamlessly with a Phillips screwdriver, ensuring a tight fit and easy installation.The real benefit of these screws lies in their construction. Made from zinc-plated steel, they're resistant to rust and corrosion. This means they can be used in a variety of environments without fear of degradation, increasing the lifespan of your projects.What sets these screws apart is their size. With a length of 9.5mm, they're compact yet robust. This makes them ideal for projects where space is at a premium, but strength and stability are still paramount.