This is a Futaba Splined Car Servo Horn K (Large-T) T-Shape.

FEATURES: Heavy duty plastic construction, black in color For 2.6-3.0 screw

INCLUDES: One Futaba Splined Servo Horn K (Large-T) One mounting screw

REQUIRES: Installing servo horn on servo with mounting screw

SPECS: Length of servo horn at longest point: 1.73" (44mm) Width: .98" (25mm) Thickness: .23" (6mm)  

BOX DIMENSIONS: 2.38" W. X .38" H. X 2.38" L. BOX WEIGHT: .01 LBS.