The 1-3/8" 4MT Exp Chk Reamer HS by Field Tool Supply is a high-speed steel tool designed for precision reaming and checking. With a diameter of 1-3/8 inches and a 4 Morse taper shank, this reamer is perfect for use in lathes and milling machines. Its HSS construction provides excellent durability and wear resistance, making it suitable for demanding machining applications. The reamer's design allows for smooth operation and efficient chip removal, ensuring high-quality results. This tool adheres to industry standards, making it a reliable choice for professionals in the machining and fabrication sectors.