The 3-15/16 Shell Reamer by Field Tool Supply is a high-speed steel (HSS) tool designed for precision hole enlargement. With a cutting diameter of 3-15/16 inches, this reamer is perfect for achieving accurate dimensions in various materials. Its durable construction ensures longevity and reliable performance in demanding machining environments. This tool meets industry standards, making it compatible with a variety of drilling systems. Whether you're working with metals or plastics, this shell reamer provides a smooth finish and precise sizing, essential for professional machining tasks.