Hex head screws bolts is fully threaded and made of 18-8 stainless steel. Hexagon bolt is suitable for heavier fasteners and its size is larger than other fasteners. Hex head screws bolts package includes 8pcs--5/16x2-1/2" bolts, 8pcs--5/16 hexagon nuts,8pcs--5/16 flat washers and 10pcs--5/16 open locking washers, which are stored in plastic bags and are not easy to lose. Features: Hex head screws bolts have good corrosion resistance, firmness and can be used for a long time. Hex head screws bolts are widely used in agriculture, automobiles, construction and other applications, and hexagonal bolts are very suitable for use in wet and wood environments. Tips: Our products are fine in workmanship. If you have any problems when using them, please contact us in time and we will deal with them as soon as possible. (8 Sets）5/16-18 x 2-1/2" Stainless Steel Hex Head Screws Bolts have good corrosion resistance, firmness and can be used for a long time 5/16 Flat washers 5/16 Nuts 5/16 Split Lock Washers 18-8(304) Full Thread，Hex head screws bolts are widely used in agriculture, automobiles, construction and other applications, and hexagonal bolts are very suitable for use in wet and wood environments.