Chicago Latrobe 420S High-Speed Steel Hand Reamer, Left Hand Spiral Flute, Straight Shank, Uncoated (Bright) Finish, 3/4" Size Left-hand spiral, right-hand cut helical flute design is recommended for applications such as keyways that have interrupted cuts Long starting taper for easy entry and accurate alignment Square on shank is suitable for holding in a tap wrench or vise Manufactured from premium high-speed steel Manufactured from premium high-speed steel