steel/copper/alluminum wing scew bolts 1) high quality control; 2)competetive price; 3)sample free; 4)related name:wing screws(butterfly nuts,stamped wing nuts) Features:1) Material:carbon steel2)Finish:Zinc Plated,Yellow Zinc,nickel plated,phosphated3)Size:M4-M10,1/8-1/24)related name:wing screws(butterfly nuts,stamped wing nuts Wing bolts/ fastener