The #21 Reamer Blank from Field Tool Supply is a high-speed steel (HS) tool designed for precision reaming applications. With a diameter of 21/64 inches, this reamer blank is ideal for creating smooth, accurate holes in various materials. Made from durable high-speed steel, it offers excellent wear resistance and longevity. The blank design allows for customization, enabling users to grind to specific dimensions or shapes as needed. This tool is perfect for machinists and metalworkers looking for reliable performance in their projects.