Bolt cable locks feature a solid zinc core and an automotive grade cylinder with a patented 6 plate tumbler sidebar to deter theft. That means the only way to open Bolt cable locks is with your ignition key. These cable locks feature a stainless steel lock shutter design to keep out moisture and dirt, and a rugged santoprene jacket, which helps to protect your gear. Bolt cables are 6 foot long, GAC coated in black vinyl to 5/16 inch outer diameter and coil sprung for compact storage. Made in the USA.