The Amazer Heavy Combination Bicycle Theft U Lock has all the expected features \u2013U shaped shackle covered in PVC plastic to protect your bike, and a secure heavy duty lock cylinder--but at a bare-bones price. It\u2019s not among the locks listed in the best bike lock buyer\u2019s guide, but is nevertheless quite serviceable as a bargain level lock. If you don\u2019t like combo locks then consider the Via Velo Bike U Lock with Cable, or if your wallet can handle it then check out the stronger-than-superman Kryptonite New York Standard Heavy-Duty Bicycle U Lock.\r\n\r\nWhy We Like It - Amazer Heavy Combination Bicycle Theft\r\nThe Amazer Heavy Combination Bicycle Theft U lock is a combination U lock with an easy to set combo, is of sufficient high quality as an anti theft deterrent, and can be had for a nominal spend. Reasonable bicycle lock protection for a very low price comparatively.\r\n\r\nPerformance\r\nU-locks (a.k.a. D-locks) are popular among bicycle owners (although can lock up anything) because they are considered less easy to cut than a cable lock or chain lock. With the Amazer heavy duty combination U Lock there\u2019s no key to misplace as with a key lock. Setting the combo to whatever 4 digit combination wanted is easy, but obviously if you forget what you\u2019ve set then it\u2019s \u201cbricked,\u201d i.e., unlockable to all but a select few pros. The Amazer heavy-duty combination is effective enough as an anti theft device. Its diminutive size may make some locking situations challenging. If a U-lock is not for you, then perhaps consider a chain lock or cable lock such as the Sportneer 5-digit combo chain cable bike lock or the Ndakter 4-feet combo bike lock cable.\r\nDesign\r\nIf you\u2019ve seen one U-lock you\u2019ve pretty much seen them all. Design variations are subtle. The Amazer design is as expected. A 12mm hardened zinc alloy U-shackle is covered in 3.8mm PVC coating to prevent scratching bike frames. The locking part is cast metal underneath a seamless plastic. Opens with a push button. A dust cover over the tumbler also serves to make it less obvious that this is a combo lock. About the only thing disappointing is the size of the U-shackle that\u2019s smaller than other U-locks in both length (6.3\u201d) and width (3.8\u201d). Some bikers may find that desirable (for storing), others less so (for locking options). Still enough to lock wheel-to-frame or to slotted bike racks, but more length would be useful.\r\nValue\r\nThe Amazer U-lock is bare-bones. It\u2019s a lock plain and simple, without accessories sometimes included with other U locks. No mounting bracket and no auxiliary braided steel cable such as comes with the SIGTUNA Bike Locks-Heavy Duty U Lock for example. But, for twenty bucks Amazer gives you a serviceable lock providing reasonable protection, impervious to most cutting attempts, although unlikely able to defend against a significant brute force attack. Fine for locking your bike in a trafficked public area for limited periods, such as in front of a store or at school or in a campus setting. Probably not the best lock to secure your bike overnight on the street.\r\nAmazer Heavy Combination Bicycle Theft Wrap Up\r\nOverall, the Amazer Heavy Combination Bicycle Theft U Lock is good for bargain shoppers or those on tight budgets who need to protect their bicycle (or something else) during their routine day-to-day activities. It\u2019s enough of a deterrent to thwart most casual theft or crimes of opportunity by causing potential thieves to seek easier targets.