hex washer head tapping screws 1.Size:M4-M12 2.Material:Carbon Steel,Stainless steel 3.Finish:Plain,Zinc plated 4.OEMService HEX WASHER HEAD TAPPING SCREWS 1) Differents size: M4-M122) Standard:GB,DIN,ANSI,JIS3) Finish:plain,black, yellow zinc, white zinc, white blue zinc, and phosphating4) Grade:4.8 5.8 6.8 8.8 10.9 12.95) Material:carbon steel, brass,stainless steel, spring steel, alloy steel6) ...