Compatible with Mostly Standard 25 Teeth Servo Motors，Fit for 1/8 1/10 RC Models,for example,compatible with Traxxas Axial Tamiya HPI HSP Wltoys Axial SCX01 RC car truck. Made of aluminum alloy,CNC machining makes it precise in size and stable in performance. A great replacement part for your rc models car. Easy and convenient to install and remove. Better than most of the plastic material. Material: Aluminum Alloy Distance from hole center to hole center:12mm,16mm,20mm Size:28.5x10x7.5mm: Package Includes: 4 x 25T Aluminum Servo Horn