This is the optional Arrma 23T Servo Arm in Red. FEATURES: Aluminum construction, with red anodized coating Fits servos with a 23T top gear For use on all Arrma vehicles Small bottle of thread lock for use on linkage mount INCLUDES: 23T Servo Arm in Red Bottle of Thread Lock SPECS: Length: 0.59" (15mm) center/mounting hole to center of ball link hole