

🔒 Lock in your security, unlock your peace of mind.
The Master Lock ProSeries 1177D is a commercial-grade, resettable combination padlock featuring a corrosion-resistant solid brass body and an ultra-tough octagonal boron-carbide shackle. With 10,000 possible combinations and no reset tool required, it offers customizable security with ergonomic dials designed for use in harsh conditions, including low light and with gloves. Its weatherproof design and deadlocking mechanism protect against prying, shimming, and cutting attacks, making it the go-to lock for professionals who demand reliability and durability backed by a lifetime guarantee.























| Brand | Master Lock |
| Item dimensions L x W x H | 1.27 x 2.25 x 3.43 inches |
| Lock Type | Combination Lock |
| Material | Brass |
| Recommended Uses For Product | Security |
| Special Feature | Keyless, Padlock |
W**R
Secure, Heavy-Duty Lock That’s Simple to Program
This lock was extremely easy to program, and the build quality really stands out. I ended up buying two—one to secure my shed door and another for my water-barrel storage cabinet—and both fit perfectly through the existing latches. The shackle is thick and solid enough that it would be very difficult—if not nearly impossible—for someone to cut through with a bolt cutter. The overall feel is heavy, durable, and well-made, and the design looks great as well. It’s the kind of lock that would make most would-be thieves think twice and move on. I’m very impressed and feel confident using it.
S**N
Reliable lock
Very durable, easy to use, and locks well
B**O
Rugged and durable
This is the second set of locks we purchased for our church ministry after being burglarized. The previous padlocks were cut so this will make it much more difficult to cut. The quality of Master Lock stood out and it's also designed for outdoors.
G**A
Sturdy lock.
Nice lock. Sturdy. The ad picture looks like you get 2 locks. It is only one though. I would change the picture to only one lock, so as not to confuse people. I thought it was two as shown in the photo. Bottom rubber a little flimsy. I like being able to set my own combination
M**O
Would recommend. Durable.
Durable, works well. Secure. Would recommend. Secured my bike for 2 solid years.
S**R
Terrible Lock
This lock is junk. I got refund and ordering a different brand. It would not lock, allow to set numbers, move the dials, and was loose inside. It felt and looked like a fake lock.
J**D
Master Lock Tight
Solid. I wish it were about 1/2 inch longer. Tight fit at my storage unit.
W**R
Rubber dial cover is designed to fail
The rubber dial cover is super flimsy, as one of the tiny little nibs just broke off so easily, it's as if it were designed to break. Now the dials are fully exposed to the elements. NOT AT ALL PLEASED WITH SUCH POOR QUALITY! WAKE UP, MASTER!
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