... -M48 2.Material:Carbon Steel,Stainless steel 3.Finish:Plain,Zinc plated 4.OEM Service newest design,high quanlity,competitive price ... ,DIN,ANSI,JIS3) Finish:plain,black, yellow zinc, white zinc, white blue zinc, and phosphating4) Grade:4.8 5.8 6.8 8.8 ...