This is the Servo Case Set for the Hitec HS-422 and HS-425BB servos. FEATURES: Black plastic servo case Top and bottom sections Four mounting screws INCLUDES: One complete servo case set Four 1.6x31mm screws REQUIRES: Installing all servo components into case SPECS: Length: 1.6" (41mm) Width: .8" (20mm) Height: 1.4" (36mm) COMMENTS: Will work only for the Hitec, HS-422, and HS-425BB servos HitecPart HRC56339