Giant Surelock Protector 2 DT is a tough 13mm ultra hardened steel lock with X2p Double bolt locking mechanism with 4 standard and 1 LED key. Features - 13mm ultra hardened steel bar - Lock: X2p double bolt locking mechanism - M-Key cylinder - Integrated dust cover - 4 standard keys and 1 LED key - All tube QR mounting bracket 24-40mm tubes Sizes - Dimensions: 115mm width 230mm long