This is the Great Planes metric precision prop reamer.
Features:
Includes: One Great Planes Metric Precision Prop Reamer with storage case
Specs:
T-Handle Length: 2.75 (70mm)
Reamer Length: 4.75 (121mm)
Hole Sizes: 7mm, 8mm, 10mm
Note: Extremely sharp! Keep well-oiled to avoid corrosion.