This is the Integy 23T Double Sided Straight Servo Horn for KO and JR Servos.

FEATURES: Billet machined aluminum construction, silver in color
          Two linkage holes per side

INCLUDES: 23T Double Sided Straight Servo Horn for KO and JR Servos and
            3mm Screw

SPECS:    Total Length: 1.6" (42mm)
          Length from Center Hole/Inner Linkage Hole: 0.51" (13mm)
          Length from Center Hole to Outer Edge: (19.5mm)

                                                                   jxs 10/22/12
                                                                         ir/jxs