Master Lock 5KA A451 Number-5 Laminated Padlock, 2"

not great if a burglar decides to buy one of these locks for his collection of keys as one fits all, not good.

I bought for my collection and for reference. While they improved over the Master Lock no. 3 by using a shackle that isn't shimmable, the core is still the same and is the easiest pick lock on the market. When I was learning to lockpick for locksport, this was the very first lock I was able to successfully open by single pin picking with less than a day of practice. A raking attack on this lock requires no skill whatsoever, takes a few seconds to open, and I can teach somebody else to do it in a few minutes. I would not recommend using this lock to protect anything, and it's an extremely poor value for the cost. At a similar cost consider the American Lock 5200 for very good protection, or almost any other lock at all for just strictly better protection.

Works with my job master, but I had to pop off the commercial plastic wrap. Otherwise it will get stuck and you will be unable to open it. Luckily I found out before actually locking it.

The quality is top notch and it fit my job box perfectly. On the down side, I ordered two individual locks, one for a coworker and one for myself. Although they did not come as a set, both keys worked on either lock. So it's a good thing I trust my coworker...

I have a rigid construction job box. These locks work perfect for them. Had to buy 6 different locks to find these but they work great. Highly recommend them if that's what you're looking for.