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The locks is very sturdy, the number wheels are easy to read and spin, and I love the easy combination setting procedure.
However, because of the way to you set the combination, you cannot just roll the numbers while the lock is open. Our use is on a chain on a gate. If you leave the gate and lock open for any reason the actual combination has to be left on the lock; you cannot spin the numbers. So, if our gate is left unlocked, anyone who knows this can just look at the numbers and know the combination.
I hope that makes sense. Another illustration is if you leave your gate open so someone can get in then you ask them to lock the gate on the way out, they see the combination and have to jumble the numbers for you when they leave.
I purchased two Master Locks believing they’re still made in the USA but when the locks arrived they turned out to be made in China. I own 3 of these locks already but I didn’t like the made in China Master 875 because the Shackle rust. Although the packaging claim the specs is the same as the ones I assume made in the USA but I know the one I bought in Home Depot made in China I use for my outdoor storage has rusted shackle. Previously to change the 4-number combo, you stick a small key on the side hole of the lock and you put the combo numbers you like and remove the small key. These made in China 875 locks instruction in changing the combo is confusing and took me awhile to finally figure out w/o a key how to change the combination. I think Amazon should put the country manufacture of the product to let us decide if the buyer wants to buy it or not instead of hiding where the lock was made.
This review is for the heavy-duty model. A key is not necessary to change the combination. I suspect that is why you cannot lock the lock without the combination. In other words, you cannot scramble the combination until it is locked. We have this on a chain for a gate, and now if we do not lock the lock after removing it, the combination is present on the tumbler. I.E. You could not open the lock, scramble the #s because it will not lock. For another person to lock it behind them, they need the combination. The combination will not scramble until you close the lock, and the lock will not close without the combination dialed in. Other than that, this model seems more sturdy than their less expensive model, which lasted us about 2-years outdoors.
I may have gotten a lemon, but I was not happy with this lock. The dials all felt loose, which made it difficult to keep the proper numbers lined up when entering the combination. Also, the shackle was tight and hard to pull up when unlocking. I emailed Master Lock, and they just said to return it, which I did. That process was painless through Amazon. I ordered a different style of Master lock, which I have been happy with. Like I said, I may have just gotten a bad one, but my experience with this lock was not good. I also wasn’t impressed with the response from Master lock customer service.
Lock froze up WEEKS ago. There's no opening it and we can't put off getting into what's been secured by it any longer, so it'll be cut off next week, to be replaced by a simpler, cheaper, locally purchased lock. REALLY disappointing. I guess I should have paid greater heed to the reviews, though every combination lock I looked at had really good and really bad reviews - similar to this heavy duty lock's reviews.
Materials and just overall build on this is a cheap copy of what Masterlock's used to be. Tumblers feel cheap and don't line-up precisely, body is not a solid material, probably cast zinc. Face plate where tumblers/numbers are looks even thinner and cheaper. Overall just a Chinese copy of a Masterlock with a rubber gasket at the top so they can claim water "resistant" - I'd pass on this one, especially for the premium price they're asking. Not impressed at all!
I ordered 2 of the Heavier Duty 875d. I noticed that when you read the reviews, they are combined for the model 875D & the 175D so you don't know which one is being reviewed. The 875D is definitely heavier & sturdier. Can't speak to how long they will last but they work smoothly & seem to be well built.