Truss/Button Head Machine Screw with Zinc Plating and Length Ranging from 13 to ... .F undercut, H.W.H, serration, flower head and othersPlating: plain, yellow zinc, zinc, black phosphated, ... in bulk, standard packing for exportThey have good quality, and reasonable priceSmall orders are acceptedWe have pass the ... SGS report, RoHS report, and we also pass the BV inspection Truss/Button Head Machine Screw