This is the Great Planes ElectriFly 8mm Prop Adapter Motor Shaft Collet 3/8-24 Output Shaft.

Features:

• Fits standard size propellers onto a 8mm motor shaft
• Large shaft size for motors with 8mm shafts

Includes:

• (1) Prop Adapter
• (1) Prop Washer
• (1) 3/8 Prop Nut

Specifications:

• Total length: 1.88" (47.8mm)
• Diameter of drive washer and prop washer: 1.1" (28mm)