internal serrated washer DIN6798J 1.standard:DIN6798 2.type:internal tooth type J 3.size:diameter 3mm-30mm 4.material:carbon spring steel, stainless steel 5.finish: zinc plated,plain,black,phosphate 6.certificate:ISO9001:2008 certificate 7.packing:polybag packing ,small box packing
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