This is a standard servo arm specially designed for rc helicopters. The use of rigid plastics allows the product to be both brittle and adaptable to the thrust requirements of the rotor head. It can protect the rotor head metal parts and the servo gears.
Installation hole distance: 14MM/17MM/20MM
Thi servo arm is suitable for most of the 25T servos. Like the ones below:
KST：BLS815/BLS805X/515/725/815/825 and etc.
Futaba:9257/9254/3003/BLS257/BLS254 and etc.
HD powere,Tower Pro MG995.MG945，MG996，MG946，S3003 and etc.
25T：Futaba,savox,Xcore,HL,HSP,HD power,Go tech
25T Standard servo arm x 4