This is the Propeller Locking Nut Set for the O.S. Max
FS-70 Surpass FS-91 Surpass FS-120 Surpass SE
91 FX FS-91 Surpass II FS-120 Surpass SP
FS-91 Surpass II w/pump FS-120 Surpass III w/pump
FEATURES: Durable steel construction.
Prevents the propeller from flying off even if the propeller
should slip or loosen due to detonation or knocking on
the 4-stroke engines.
INCLUDES: One metal propeller washer (11mm I.D., 28mm O.D., 3mm thick)
One metal hex lock nut (sandwiched between prop washer and
expansion bolt)(7mm I.D., 14mm O.D., 9.5mm thick)
One metal hex expansion bolt (installed last inside the lock nut)
(7mm I.D., 12mm O.D., 8mm thick)
SPECS: Bolt Threading: 5/16" - 24