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Got this lock to practice deciding on. It is painfully easy to decide with no tools to the point where it isn't a good lock to learn on. Okay beginner lock to learn on but you will quickly outgrow it and do not use to secure valuables.
Bought this to lock a trailer that’s outside and exposed the the Florida coastal elements. Worked great for all of 2-3 months… then it became VERY difficult to lock.. seems that the internals cannot withstand elements.. not to mention how easy it is to break into after just watching a short YouTube video. LOOK FOR A BETTER LOCK!
I used this lock on the furnace room at my cabin. I needed to get in to install heat tape on my water main because the temperature was in the low 10s F. The lock wouldn't open with the combo, even when it was above freezing. The next day I was able to get in because it was a warmer day and faces the sun. I removed the lock and will not be reinstalling it.
I bought this for my boat. Although it is made of brass and claims weather-resistance, this lock did not work well at all. The little combination dials were difficult to use even brand new, and became corroded within a week of purchase. I had to rinse with fresh water and bang on the side of the lock several times to get the dang thing to unlock. Ugh. I replaced this lock with an Abus lock which is working well so far.
Buy the same lock that's painted black # 178D and save yourself over 20%. I purchased both locks in the same order, # 175D is the same lock painted a brass color. If you want a marine quality combination lock buy a Sesamee.
If you search "master lock 175" on youtube you can find a multitude of methods that a scoundrel might use to bypass it and the shackle thickness could be better, but the mechanism works exceptionally smoothly.
I liked the idea of a combination lock but unfortunately the mechanism that allows you to set and reset your combination is easily accessed with a pointy object. Anyone can stick something in there and open the lock.
MASTER LOCK 175D. I purchased three of these from Amazon, two seemed to operate OK (I've not used them yet for any length of time); HOWEVER one was inoperable (would not lock) after going trhough the same inital combination setting process successfully used on the other two. So, for a security lock, 2 out of 3 is not an acceptable number for me. I now wonder IF one may fail in the LOCKED position.
When I looked more closely at interior mechanism of the opened locks, the interior detent which mates with the shackle notch was made of brass (a soft metal) and thus it seems to me that a good, hard, well-placed blow by a heavy hamer could broach the sharp triangular brass detent edge; (I haven't tried this).
While the heft, weight, and case hardened shackle may give one confidence, I'm not sure the internal lock mechanism is worthy of such confidence. OK for the price IF it is not defective (as 1of3 was), but if you need REAL SECURITY, and if you need reliability greater than 2of3, I'd look elsewhere.
Great strength and easy to set the combo. The combo tumblers are not smooth and tend to jam up easily. Also if left unlocked the combo can be changed by using a universal key that comes with rack of these models. Lastly the code tumbler numbers are very small and hard to read.