Check the listing for details. 6 Ft 3/8" Chain And Lock Kit Heavy Duty Chain Lock Security Long Chain Bike. Color: Black, Silver, Condition: New. Listed at 42.26 USD. Description This security chain and lock kit is made of high-quality manganese steel, which is strong and durable. Unlike other common chains, it is square-shaped and more effective against attacks with tools. It also features a canvas sleeve to prevent the items and chain from scratches and damage. This kit can offer top security against all types of aggressive attacks and is perfect for preventing your most valuable bikes and property from theft. Key Features High-quality Material: This product is made of high-quality manganese steel, which is wear-resistant, corrosion-resistant, anti-rust, strong, durable, and not easy to deform. High Safety: The square link shape of the chain does not allow bolt cutters to get a proper grip, so it cannot be cut with bolt cutters or hand tools. Meanw.