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On Guard Mastiff Chain With Boxer U-Lock


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Longer titanium reinforced, hardened steel hexagonal link chain for more locking options. Boxer U-lock can also be used alone as a disc lock.


  • Security Rating: 92
  • Lock Series: Mastiff
  • Technology: X4P

Additional Features:

  • 5 laser cut keys (1 micro-light and 4 extra grip keys) Micro-light key projects a bright white beam.


How long will it take to arrive?

Please check the stock availability notice on your item when placing your order. This item is: Sold out

How will I know it has been sent?

You will receive an email to confirm when your item has been sent.

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Please allow 10 working days from dispatch of your order before notifying us of any late deliveries.

It may be advisable to check with your neighbours to see if a parcel has been left with them, check any outhouses you might have where it may be left if it cannot fit through your letterbox and contact your local sorting office to see if the item has been returned to the depot as undelivered and awaiting collection.

If I'm not completely happy with my item?

Please see our returns policy.

Customer Reviews

Overall Rating : 2.0 / 5 (1 Reviews)
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  • 1 2 star reviews
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Top Customer Reviews

Where reviews refer to foods or cosmetic products, results may vary from person to person. Customer reviews are independent and do not represent the views of The Hut Group.

Boxer Ulock Broke when droppedickly

My 2 Mastiff chains with Boxer Ulocks were delivered 12/09/2019 and today is almost 2 months later. I dropped the lock portion on the sidewalk from approx 26 " and it broke the locking mechanism. A little spring is now sticking out and the lock is nonfunctional. The chain itself isn't as nice as it should be - only the first links are cleaned up from big sharp welding debris pieces and the cloth isn't as long as it could be to prevent scratching. The velcro cloth fasteners aren't very good (they become detached a bit too easily) compared to how Kryptonite finishes their locks with a rubber guard to prevent scratching your bike. Nevertheless , the OnGuard price was good. Now not so happy with OnGuard. If a drop of 2 feet kills it, how would it stand up to a real attack?