YO906T Size: 20* 27mm. Used to connect control surface such as rudders and ailerons to the airplane. Includes control horn base， control horn underplates and self tapping screws. Ideal replacement for helicopters. Also a must for models DIY use.     Package Details Weight: 2.14 g Size: 3*2*2 cm Package Includes 1 × 20 x 27mm Servo Horn Set