precision screw 1.Liner bolt washer 2.Excellent quality 3.Model:M20--M52 4.Surface treatment,as customer*s requirement BoltsNon-standard bolts 1) Materials:Carbon steel,stainless steel,brass etc.2) Finishing:plain,black,zp,yzp,H.D.G.,dacromet etc.3) Grade:4.8-12.94) Standards:DIN,ISO,UNC.BSW and unstandard etc.5) Packing:paper bag,small box,wooden case,pallet etc.6) We could customize according ...