This package includes 50pcs 5/16" Spring Lock Washers (split lock washers), crafted as standard 5/16" size, perfectly matching 5/16" screws, nuts, and bolts for home repairs, industrial assembly, or DIY projects. Crafted from high-grade 304 stainless steel, these split lock washers offer excellent corrosion, rust, and oxidation resistance, durable in high humidity, extreme temps, or outdoors without deformation. With offset split ends, they bite into materials when tightened, preventing loosening from vibration/mechanical aging, and as heavy duty washers, they boost bolt tension for stable assemblies. Widely used in sheet metal, deck building, automotive repairs, etc., they protect materials from bolt/nut tearing. Note: 304 stainless steel has inherent weak magnetism (from manufacturing), a normal trait without strong magnetic properties.