Union Butterfield HSS Bright Straight Chucking Reamer ANSI.1865. Straight Flute, Right Hand Cut. Chucking reamers have shorter and deeper flutes than hand reamers and are specifically designed for accurate machine reaming in most materials and equipment including screw machines, turret lathes, drill presses, and machining centers. Recommended for most general purpose reaming. Produced per ASME B94.2-1995 Standards.