Giant Surelock Force 2 is a tough chain lock featuring 8mm titanium enforced hardened square steel links and an 11mm ultra hardened steel Shackle, with an X2p double bolt locking mechanism and a cover to protect your frame. Features - 11mm ultra hardened steel Shackle - Lock: X2p Double bolt locking mechanism- Chain: 8mm titanium enforced hardened square steel links- M-Key cylinder- Integrated dust cover- 3 standard keys- Chain Cover