... /Button Head Machine Screw with Zinc Plating and Length Ranging from 13 to 300mm Head type: CSK/flat head, truss head, trumpet head, wafer head, pan framing head, pan wafer head, hexagon head, pan headThread ... Square, H.W.F undercut, H.W.H, serration, flower head and othersPlating: plain, yellow zinc, zinc, black phosphated, grey ... , and we also pass the BV inspection Truss/Button Head Machine Screw