You're getting a lot of value for your money with the Giant Surelock Protector 2 U-Lock.  In one pack you get both a D-lock and a Cable lock, so you can secure your frame and a quick release component.  D-locks like the Surelock Protector are effective because your frame is protected on all four sides.  The keyway is pick resistant and the design of the lock body is great against both leverage and cutting attacks - making for a strong deterrent.The DT U-lock is made from a super strong 13mm thick hardened steel lock with a double bolt locking system for maximum security.   Included in the pack are 5 keys so you have plenty of spares if you lose a couple.  Also You get an LED key which is so helpful when you're locking up at night.Weight - 1.65kg (includes keys & fittings)Features:13mm ultra hardened steel barLock: X2p Double bolt locking mechanismM-Key cylinderIntegrated dust cover4 standard keys and 1 LED keyAll tube QR mounting bracket 24-40mm tubesAdditional 10mm x 120cm cable