This is a 6x4 Sport Gas Airplane Propeller.
It is a "tractor" (not a "pusher") prop.

FEATURES: Computer-optimized design gives these props a thinner profile
and more "bite" with less noise.
Lightweight molded nylon construction reduces rotating mass for
higher output and longer life.
Reinforcing carbon fibers help maintain true, constant pitch at
any rpm.

INCLUDES: One Carbon-Reinforced NYLON Propeller

REQUIRES: ALL props require balancing, this is VERY important, use TOPQ5700.
May need prop reamer, use GPMQ5005 (SAE) or GPMQ5007 (metric)

SPECS: Length: 6" Pitch: 4"
Hole diameter: 1/4"