OMPHOBBY M4 Helicopter bearing ∅20x∅27x4m OSHM4092 Sale! from 491 /per Qty. Add to Cart This is a replacement bearing ∅20x∅27x4m for the OMPHOBBY M4 Helicopters Contents bearing ∅20x∅27x4m-2 Qty available:1 SKU:OSHM4092