Standard: DIN7990 Size: M5---M30 (DIA. ) Material: Lowcarbon steel, middle carbon steel, alloy steel, stainless steel 304, 316, 201 Class:8.8, 10.9, 12.9Surface: Zinc plated(yellow, black, green), black oxide chrome plated,Cr+3, hot dip galvanizedPacking: 1) Bulk packing: about 20-25kgs per carton. load cartons in pallets 2) Assortment in poly bag or plastic box