This is the Great Planes Standard (SAE) Precision Prop Reamer.

Features

Enlarges holes in propellers and spinner back plates-just turn the
removable T-handle to cut perfectly centered 1/4" 5/16" and 3/8"
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 Standard (SAE) Precision Prop Reamer with storage
case

Specifications

T-Handle Length: 2.75" (70mm)
Reamer Length: 4" (102mm)
Hole Sizes: 1/4" 5/16" 3/8" Standard (SAE)

Comments

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