●2-piece RC steering servo horn arms, compatible with most servo motors with 25 teeth. ●The overall size is 28 x 10 x 7.5mm/1.1" x 0.39" x 0.39 ●3 holes, each with M3 thread. ●The distance from hole to hole is 12mm, 16mm and 18mm as shown in the pictures. ●Hard aluminium construction, sturdy and durable and has a long service life.