OMPHOBBY M4 Step Socket Cap Screw M2.5x6mm OSHM4105 Sale! from 357 /per Qty. Add to Cart This is a replacement step socket cap screw M2.5x6mm for the OMPHOBBY M4 Helicopters Contents Step socket cap screw M2.5x6mm-8 Qty available:1 SKU:OSHM4105