The 0.4090 Chk Reamer SF SS HS from Field Tool Supply is a high-precision reaming tool designed for creating smooth, accurate holes in various materials. With a diameter of 0.4090 inches, this reamer is ideal for finishing holes to exact specifications. Made from high-speed steel, it offers excellent durability and cutting performance. The reamer's design ensures efficient chip removal and reduced friction, making it suitable for both professional and DIY applications. This tool meets industry standards for quality and reliability.