• 10mm 54″ 10.5 lbs. with integrated lock has a Four Star plus security level rating making this lock highly theft resistant for high crime areas
  • Patent pending X4 Power Quattro bolt locking mechanism provides maximum protection
  • Integrated lock has a dual steel ball locking mechanism to provide greater defense

Product Description
OnGuard Mastiff Integrated Chain 10mm 54″ 10.5 lbs. with integrated lock has a Four Star plus security level rating making this lock highly theft resistant for high crime areas
Patent pending X4 Power Quattro bolt locking mechanism provides maximum protection
Integrated lock has a dual steel ball locking mechanism to provide greater defense
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By - Bicycle Chain
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  1.  D. Le said:

    January 25, 2010 @ 6:28 am

    Pros: super strong, the nylon coat protects my bike’s paint

    Cons: super heavy, the built-in lock jams frequently (leaving me in the rain/cold trying to jiggle my key free)

    The lock jams are super annoying…I might look into buying a different version.

    Update: key broke in lock the other day…epic fail…DO NOT buy this lock!
    Rating: 1 / 5

  2.  Penny Joshua said:

    January 25, 2010 @ 7:40 am

    This chain is advertised on Amazon as being 54″, but it is really 44″. Otherwise, this was a terrific buy. I was using the Onguard Beast 5017 for my moped but it was too thick and scraping the metal inside the tires everytime I used it. This one is just as secure but smaller. I like all the Onguard chains. They are imposing to look at and strong to use.
    Rating: 5 / 5

  3.  R. Valera said:

    January 25, 2010 @ 10:04 am

    i like the fact that this is one piece, not a separate chain and lock, unlike the kryptonite NY lock that i used to own. this thing weighs a ton and looks aggressive (especially when locked to a bicycle). price point is very excellent. so far no problems with the locking and unlocking.
    Rating: 4 / 5

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