This is the Great Planes Metric Precision Prop Reamer.

Features

Enlarges holes in propellers and spinner back plates-just turn the
removable T-handle to cut perfectly centered 7mm, 8mm, and 10mm
holes
Constructed of hardened carbon steel
Stepped design increases accuracy
Includes plastic storage case
Can be used with a drill press for extra precision

Includes

One Great Planes Metric Precision Prop Reamer with storage case

Specifications

T-Handle Length: 2.75" (70mm)
Reamer Length: 4.75" (121mm)
Hole Sizes: 7mm, 8mm, 10mm (the first step is 1/4" (6.35mm))

Comments

Caution: Extremely sharp. Keep well oiled to avoid corrosion.