These are Futaba Servo Horn Screws. These screws secure the horn to the splined output shaft of the servo.

FEATURES: Keep extras on hand, or replace missing horn screws. Black in color, constructed of hardened steel for long life. These screws fit the following Futaba servos: S9401 S9102 S134 S136G S9403 S9202 (FUTM0090) S9301 S3104 S9201

INCLUDES: Ten Servo Horn Screws

REQUIRES: Phillips screwdriver (DTXR0170) to install servo horn with screw.

SPECS: Length: 0.39" (10mm) Width: 0.10" (2.6mm) ir/jl  

BOX DIMENSIONS: 2.38" W. X .25" H. X 2.38" L. BOX WEIGHT: .02 LBS.