Hackle seems very sturdy, steel. Reassures me that contents in my backpack are that much more secure. They are sturdy- not flimsy.

These locks are extremely flimsy and are a shade better than those cheap little luggage locks that come with cheap luggage. Not that stickers matter all that much, but they have come off all 4 locks so they are pretty ugly now too.

The locking mechanism has a very rough action. A second lock seized on the first key turn. It is hard to get the keys to slide into their slot.

There is a seam that makes it look like it will dismantle itself with rough travel conditions. Defective and possibly counterfeit locks.