The 0.3900 CHK Reamer from Field Tool Supply is a high-speed steel (HSS) tool designed for precision reaming applications. This reamer features a straight flute design, ideal for creating smooth, accurate holes in various materials. Made in the USA, it ensures durability and reliability. With a diameter of 0.3900 inches, it is perfect for use in metalworking and machining tasks. The reamer is compatible with standard drill presses and can be used in conjunction with other cutting tools. Its high-quality construction meets industry standards, making it a valuable addition to any tool kit.