OMPHOBBY M4 Helicopter Tail Rotor Hub OSHM4044 Sale! from 397 /per Qty. Add to Cart This is a replacement tail rotor hub for the OMPHOBBY M4 Helicopters Contents Tail Rotor Hub-1Socket cap screw M2x6-2Washer Φ2xΦ4.5x0.2-2Set Screw M3x3(set screw)-1 Qty available:4 SKU:OSHM4044