WD-40 8 oz Smart Straw is a multi-purpose aerosol spray used for lubricating moving parts, freeing rusted or stuck components, and protecting metal from moisture and corrosion. The Smart Straw stores on the nozzle and flips down for a narrow, controlled stream or flips up for a broader spray, allowing precise application in tight spaces. Commonly used on hinges, bolts, tools, bike chains, and outdoor equipment, it is practical for DIY, automotive, and household maintenance. Follow label instructions for safe use and storage.