This is the Metal Gear Set for the Hitec HS-925MG Servo. FEATURES: Replaces all worn gears inside servo. INCLUDES: One Metal Gear Set for the Hitec HS-925MG Servo with 1st, 2nd, 3rd and 4th gear, plastic spacer, and 5mm x 8mm phillips head screw. REQUIRES: Phillips screwdriver to open servo case. Removing old gears and replacing with new ones.HitecPart HRC56382