I was reading about "lock bumping" in the news. so I bought a set of bump keys on Fleabay (very cheap) just to try it out on my existing front door lock, to see if this is really possible. Also watched a YouTube video as tutorial. So when the keys arrived I tried it out and indeed - without any previous bump training, I had my own front-door lock open in 10 minutes. If I can do that in 10 minutes, a well-trained burglar does that in 10 seconds. So I immediately decided to replace the old lock with a bump-free lock. This Mul-T-Lock is doing the job. it is easy to install (fits the door-hole of the old lock like T), is sturdy and not too expensive. The only thing I do not like is that you get only 3 keys. It comes with a card-code which allows you to order more keys ($15 each, not cheap) at particular locksmiths but my problem is that you then give that locksmith your keycode AND your address. Seems risky to trust someone with that. The way I am going to solve that is to have an acquaintance order the keys for me, who lives at a completely different address (city even). I recommend you do the same if you order this product.

I bought this lock as a more secure replacement for the top-of-the-line Schlage deadbolt I purchased at Lowe's a few years ago. My old lock was rated ANSI Grade 1, and highly resistant to kick-in and picking, but vulnerable to bumping. The Cronus uses a different cylinder design with a side pin that makes it difficult to pick and much more resistant to bumping. It's probably far more likely that a would-be intruder will just try to kick your door in or use a pry bar, so it's critically important to use a sturdy strike plate and secure it to your doorframe with 3" screws instead of the shorter ones that often come with lock sets. Still, bumping is a common practice and there are plenty of videos online showing how it's done. I read in an online forum that although the Cronus is only rated Grade 2, the overall build quality is superior to the locks you'll find at your local home improvement or hardware store. Installing the Cronus was very quick and easy, requiring only a Phillips screwdriver (assuming you are replacing an old lock; a new door may require drilling holes and mortising with a chisel). Instructions were very easy to follow. One thing the instructions did not cover, however, was installing the cylinder in the outsider cylinder housing. Unlike other deadbolts I've purchased, my Cronus arrived with the cylinder separate from the housing. I simply removed the two small Phillips screws from the back of the outside cylinder housing, pulled off the outer ring, inserted the cylinder, and screwed it back together. Really much simpler than it sounds. Then I followed the included instructions to install the lock. The deadbolt took only a few minutes to install, but since I needed to reinforce my door frame and put in a sturdier strike box, I had to do some drilling and mortising on the frame, but most of you won't need to deal with that. I would definitely recommend this lock.

This lock is much more secure than the fancy keypad lock we had that was not only easy to pick or bump, its chunky design made it easy to wrench off the door. I was home one day just a month ago when I heard someone messing with my front door lock and realized later after watching a YouTube video on Ring attempted break-ins, this intruder was using a bump key. Bump keys rely on cylinders that drop when they hit it with something like a small hammer or tool. Our old lock was easily bumped and it's predecessor of the same design had been broken, possibly by the burglar who stole some jewelry a couple of years back who had essentially wrenched the lock loose with either a screwdriver or small crow bar. This lock is heavy duty and without any light weight or loose covers. It looks like it will be difficult to get a screwdriver underneath it. It only takes a second or two to bump most of the locks on the residential market. This key is a bump & pick proof key - it has a square exterior with the key mechanism inside. So I think it would be extremely hard to bump. The keys have to be ordered online from the manufacturers website in our area. It's doubtful a burglar would be dragging around a bump key for this particular lock as it is not very common. As burglars are looking for an easy and quick way in, once they realize this lock is remotely more difficult, they will hopefully move along.

Great lock but you do Not get what you see in the photo; you have to get the 3rd key made by a locksmith. So its not really the value you think it is.

I saw a lot of reviews about this not including 3 keys so I was surprised to get the 3 keys and everything included was perfect but I was surprised and a bit disappointed that it was for a larger bore hole than my average knob I had so I had to enlarge mine but it was not complicated and I didn't need to order anything to make the adjustment