Squire Hammerhead Cycling Shackle Lock & Cable Pack Unique Double Locking Mechanism With 13mm Hardened Steel Body For Maximum Protection & Security Octagonal Sleeve Makes It Harder For Mechanical Tools Catch Grip And Get Through The Lock Keyhole Cover Protects The Internals From Water & Dust To Ensure Longevity; 23cm Long Features 5 Pin Tumbler Locking Mechanism With Anti-Pick Protection; Sold Secure Gold Rated Includes 180mm Long Multi-Strand Octagonal Extender Cable That Allows For Greater Versatility