Specifications Flat head hex countersunk bolts Size:m3-m16 Length:10mm-180mm Material:carbon steel, stainless steel304/316, alloy steel Flat head hex countersunk bolts 1) material: high quality carbon steel and alloy steel Class :4 , 5, 6, 10, gr.2, gr.2h , gr.Dh 2) material :stainless steel :304 , 316, 304l , 316l , 410, 430 Class: a2-50 , a4-50 , a2-70 , a4-70 , gr.B8, gr.B8m Surface refine : Part galvanization , colorful galvanization , army green galvanization , black galvanization , steam black , ash phosphorus , brass , nickel plate , chrome plate , heating galvanization , zinc plated(yellow, black, green) Packing: 1) bulk packing: about 20-25kgs per carton. Load cartons in pallets 2) assortment in poly bag or plastic box. 3)as to customers' requirement Poly bag, small box, carton + pallet