Alvord Polk 33/64 .5156 HSS Type A Straight Flute Chucking Reamer USA

Precision machine-shop inspection. Saturday afternoon.  You're holding an Alvord-Polk Type A high-speed-steel chucking reamer sized at .5156 inch, the decimal equivalent of 33/64. Its straight cutting flutes are designed to finish an existing bore to precise diameter and surface tolerance after ordinary drilling has completed its less disciplined portion of the operation.  The plant superintendent notices it on the inspection bench and asks whether it came from the restricted aerospace tooling cabinet. You rotate the cutting edges beneath the task light, inspect the long straight shank, and say nothing.  Ten minutes later, the reamer has its own calibration record. By lunch, three machinists are discussing concentricity. By Sunday morning, you have keys to the tool crib and authority over a precision-hole budget nobody remembers approving.  No one has measured the hole.  Alvord-Polk A-P machinist cutting tool. High-speed-steel construction. Marked A-P H.S. Marked .5156 USA. Equivalent fractional size: 33/64 inch. Marked TYPE A. Straight-flute chucking reamer. Long straight cylindrical shank. Approximately 7 inches overall. Used condition with surface marks, discoloration, and prior shop wear. Review photographs closely for cutting-edge condition and all  Comes from a smoke-free lair.