304 stainless steel construction provides corrosion resistance and durability in a variety of environments. Bolts Nuts and Washers Assortment Kit includes 1/4", 5/16", and 3/8" nuts and bolts, flat washers, and spring washers. Standard hex head screws with clean threads and even torque offer precise grip and faster fastening in many applications. Package includes: 34 pcs 1/4-20 bolts, 12 pcs 5/16-18 bolts, 8 pcs 3/8-16 bolts, plus 66 nuts, 66 washers, and 66 spring washers, for a total of 260 pieces. Meets a range of daily mounting and repair needs. Box with Compartments keeps everything organized. The portable firm box has labeled compartments and a size information sheet pasted on both sides for quick size reference. Use scenarios: - Assembling outdoor furniture or garden structures where moisture resistance matters. - Home repairs and DIY projects that require reliable fasteners and easy size matching. - Automotive, bike, or equipment maintenance where varied bolt sizes are common and fast setup is desired.