1) Hex nuts2) Material: Carbon steel - Q915, Q215, Q235, 1008, SWRCH8A, SWRM6, SWROH35K, 35ACR, 40ACR, 45#, 40cr, 10B21, 10B33, 10B38, B7, stainless steel - 304M, 304HC, 316, 416 3) Dimension: 2mm-56mm, 4#2 1/4" 4) Length: General (6mm-1000mm, 3/8"40" ), we also can produce according to your requirement 5) Coating: Plain, Black, Yellow Zinc, Blue Zinc, HDG, Nickel, Dacromet Zinc, Mechanical Galvanized 6) Packing: Small box with plastic bag, 25kgs bag or box, bulk in pallet