This is the Metal Gear Set for the Hitec HS-205 and HS-225 Servos - HRCM3124. FEATURES: Replaces all worn gears inside servo. INCLUDES: One Metal Gear Set with 1st, 2nd, 3rd and 4th gear, plastic spacer, and 2.5mm x 7mm phillips head screw REQUIRES: Phillips screwdriver to open servo case Removing old gears and replacing with new ones kpm02/01/2007 ir/jxs