Master Lock ProSeries Brass Padlock, Set Your Own Combination Lock, Commercial Grade Locks with Code for Tools, Fences, Gates, 2-1/4 inches Wide, 1177D

Potential intruders will cry when they see this. It is designed with extended collar protection that rises almost to the height of the shackle. Making it impossible to approach with a bolt cutter. It is heavy. It is solid. I got the combination version. I'm prone to losing keys. It may take a moment to get the shackle to latch. Just took some practice. I didn't know what I was doing ( never seen one before) and it took 10 minutes from instructions to full deployment.

I like this lock. Feels well built. Nice and beefy

very sturdy. Great quality!

I bought this ProSeries lock as they claim they have a 10mm Shackle. My chain is 10mm so I figured I would keep it all at this thickness. In reality the "points" of the octagon are at 9mm/9.2mm and the flats are only 8mm. I think it is a fairly robust lock and I have other other master locks that work great. The shroud around the shackle I think makes it more secure as it's tougher to get a bolt cutter on it. But as I said they should not call this a 10mm lock. Look at the difference between a true 10mm chain and the lock in the pic's.

Strong, secure and heavy duty. I loved it. It was just as I expected, wanted and needed for fence gate. Ease of opening, look, size and lock functionality.

Have been using this as my gym lock (overkill, I know - but as I got my laptop stolen, I'm done screwing around) - it fits with very little clearance left in the lock hole (about the width of a human hair), so its a perfect fit. You cannot move it around or yank on it very easily. It is incredibly heavy and rather intimidating looking. The brass armor shroud around it is incredibly sturdy and does a good job of making life difficult for anyone with a bolt cutter. The boron alloy shackle is also much higher quality than the standard locks you find on the shelves, with a very true metallic feel. The combination are definitely on the stiffer side - they will not easily glide like tiny padlocks. In 3 months, I have not experienced the "sticking" issue, but the tumblers definitely prefer to be turned one way, which is not really a big deal for me.It is important to note that the lock only opens one way, and the dials will get easier to move with use, but they are STIFF. Personally, I like it as it reinforces the whole tough look of the lock. The rubber bumper, which I presume is to keep the lock from scratching whatever it is rubbing against, is flimsy and I lost it on the third use. Again, not a big deal.No padlock is going to be a foolproof solution in the world of sledgehammers, shotguns, and bolt cutters - but this intimidating looking lock definitely fits the bill to help persuade a would-be thief to perhaps move onto an easier target - (or at least convince them that bringing giant bolt cutters to a gym is too risky).

Defective

Security rust resistant works great