Corrosion resistant, rust resistant, and impact resistant; sturdy and not easily deformed for long lasting durability. Four sided angular design with tightly connected interfaces and higher density of hard metal for greater tearing resistance. 5 mm thick chain that is waterproof and rustproof for reliable outdoor use. Polyester protective cover protects the chain, helps prevent rust, and guards vehicle paint from scratches during use. Key attributes Function: outdoor security chain designed to withstand weather and resist tearing. Size: 5 mm chain diameter. Material: hard metal chain with a polyester protective cover. Performance: waterproof, rustproof, corrosion resistant, and impact resistant. Practical use scenarios Securing a car or motorcycle outdoors while the protective cover minimizes risk of paint scratches. Locking bicycles or outdoor equipment to fixed posts or racks in exposed environments. Storing boats or other outdoor gear in damp or coastal areas where moisture exposure is a concern.