Leash Length 4ft, metal chain diameter 3.0mm, suit for medium dogs. The Chain Leash is made by iron with Multi-layer plating process,anti-rust and Durable. Comes with heavy duty swivel Clip Hook, strong tensile resistance, flexible to link any dog collars or harness. The Handle is made by Nylon and PU leather padding,with breathable holes,very comfortable to hold. Easy use, easy clean, easy maintenance, no chew, no rust. Petiry Heavy Chain by Multi-layer plating process and seamless welding and absolutely sturdy,anti rust for maximum strength and durability.