OMPHOBBY M4 Helicopter Main Rotor Grip Arm Set(Black)OSHM4010B Sale! from 1208 /per Qty. Add to Cart This is a replacement main rotor grip arm set for the OMPHOBBY M4 Helicopters Contents Main Rotor Grip Arm -2socket cap screw M2.5x6-4Swashplate Spherical Joint Φ8*Φ11*6-2 Qty available:3 SKU:OSHM4010B