hex washer head tapping screws 1.Size:M4-M12 2.Material:Carbon Steel,Stainless steel ... .Finish:Plain,Zinc plated 4.OEMService HEX WASHER HEAD TAPPING SCREWS 1) Differents size: M4-M122) Standard:GB,DIN,ANSI,JIS3 ... according to customers' drawings or samples hex washer head tapping screws