This Is A Short Propeller Adapter Nut from Dave Brown Products.
FEATURES: Plain black, CNC machined steel construction.
Use with 2-1/2" spinners and under.
This prop adapter kit tightens the backplate and propeller onto the
engine, then using a single bolt-on design, holds and centers
each spinner perfectly on its baseplate.
Will fit the following engines:
All YS 2-Strokes, OPS Maxi .30, Webra .61-1.20
INCLUDES: (1) Propeller Adapter Nut
(1) Propeller Washer
REQUIRES: 1/2" Wrench
Spinner Cone & Bolt
SPECS: Crankshaft Thread Size: 8 x 1.25mm
Spinner End Thread Size: 10-32
Nut Length: 0.875"