Brass is an alloy of primarily copper and zinc,it is highly corrosion resistant and electrically conductive. it is used primarily for its appearance,good strength and workability. Our brass machine screw was manufactured according to ANSI,DIN,BS,etc. Head style:Flat,oval,Round,Pan,Fillister,Combination drive,Truss,Cheese,etc. Diameter:#0-3/4"(M2-M20) Length:1/8"-6" (3mm-150mm) Packing:polybag and carton