This is the Replacement Gear Set for the Hitec HS-85BB Servo, HRCM3412.

FEATURES: White nylon gears, all gears for servo

INCLUDES: Five gears for the Hitec HS-85BB Servo

REQUIRES: Installing inside servo case  

BOX DIMENSIONS: 2.25" W. X .38" H. X 3.00" L. BOX WEIGHT: .01 LBS.