1.screw material:C1008/1022/stainless steel2.screw head types:flat,truss,pan,round,pf.pan washer,indented hexagon washer.3.screw drivers:phillips,pozidriv,hexagon.....4.screw finish:zinc plated,nicke plated,black5.screw standard:GB,JIS,ISO,ANSI,DIN6.screw thread:fine,coarse thread,double thread