OMPHOBBY M4 Helicopter Main Rotor Thrust Bearing OSHM4058 Sale! from 470 /per Qty. Add to Cart This is a replacement main rotor thrust bearing for the OMPHOBBY M4 Helicopters Contents Main Rotor Thrust Bearing Φ5xΦ10x4-2 Qty available:3 SKU:OSHM4058