Ninetonine Pack of 475 M4 M5 M6 Stainless Steel Hex Head Bolts Screws Nuts Flat and Lock Washers Assortment Kit Include: Hex Head Bolts Screws, Nuts, Flat and Lock Washers Material: 304 Stainless steel, Head type:Hex Head Size: M4 M5 M6 Package included( Please check it in description) Total 475 pieces Hex head bolt washers assortment kit with free plastic box