Description: Size : M4.8~M6.3 ; #10~#14 ; 3/16~5/16" Length : 32mm~300mm ; 1-1/4"~12" Material : Carbon Steel . Stainless Steel Thread type : Hi-Lo Thread Point type : Sharp point and Diamond point Surface Treatment Zinc plated, Yellow Zinc plated, Black zinc, Zinc Nickel, Mechnical Galvanized, Ruspert, Slat Spray Test according to customer requirement. Standard : DIN, IFI, JIS, according to customer's drawing Package : Bulk packing, Box packing, Bag packing, Blister Flat head concrete screw Usage : Concrete screw is used in wall concrete screw and concrete material usage; Flat head and hex head concrete screw are the general head of concrete screw. Due flat head concrete screw drills, it is parallel with object. So that, it can use in appearance object. Concrete screw is used with anchor to enhance stand-up.