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It's a really good lock, but eventually it locked me inside my own house The code changed on its own, don't know how. we had to use a huge hammer and bang open the lock. I set only 1 set of code, the lcok was good for 2 weeks, but suddenly, it changed the code on it's own, and never opened
This padlock is faster to open without the code than when using the code (check the video). The security flaw is well known by thieves, and you should never secure valuables with this lock. Other Master lock models with number starting with 17... or M17... have the same issue.
I purchased this lock primarily for the resettable four digit combination. Some other reviews said that the combo sometimes resets itself. I tried it anyway. Well it did that to me. We reset the combination to a family standard. We used the lock to secure our kayaks. Multiple family members used the kayaks with that combo and then one day we couldn't open the lock. Absolutely zero chance we were using the wrong combination, so the combo had reset itself. No problem though, a quick internet search found no less than four methods to quickly crack a Master lock model 175 and they all work. And worse when I got this lock home I went at it with the drill and an angle grinder. It's basically made of paper mache, nothing, not the case, the combo face plate or the shackle took more than a couple of seconds to get through with power tools. So this lock is likely to keep you out but not the crooks. So while the features are great the quality and reliability are poor and this lock isn't worth it.
I haven't written many reviews lately, but I felt compelled to write this one. Ordered both the Master Lock and Sesamee Lock linked below for 2 sets of double doors on a shed. Right out of the box the Master Lock was clearly inferior in quality in several aspects. After the first ice storm of the season, which was very very mild, the Master Lock froze up, but the Sesamee worked just fine. Spend a bit more and buy the Sesamme. You'll be happy you did.
Sesamee K436 4 Dial Bottom Resettable Combination Brass Padlock with 1-Inch Hardened Steel Shackle and 10,000 Potential Combinations
Not the Master lock of old! Price was good and it looks great , just like those of 30 years ago, but after less that a months exposure to our somewhat brackish sprinkler well water and salt air the rotating dials began to pit and corrode significantly. It showed a much wear after a month as my old Master lock did in ten years of exposure to Florida beach-side air. Around here the air is so corrosive that I think wood will rust! If live away for the coast I'd imaging this lock would be fine.
I had a Sesamee combo lock for my shed that's worked great for years. I decided to get another lock, but went with the master lock because it was a bit cheaper, and immediately found that I hate it. The wheels are spongy, hard to turn, and the lock just generally feels cheap. I question how long this thing will last and how easily it will work in the winter with freezing temps and ice. Back to Sesamee for me.
Update: After approximately 6 months of use on my shed, it did in fact stop working. The combination failed to unlock the tumblers after repeated attempts to unlock it. Applied some wd40 and gave it some time and it finally popped open. Complete junk.