Mul-t-lock MT5+ Hercular Single Cylinder deadbolt w/Thumb Turn - Satin Chrome

I know that sounds like a fake title, but its true. I have had to contact the seller twice and both times they have helped including sending me new screws that were lost during installation. Locks are heavy duty. Very happy with them.

Very expensive lock! So, you would expect perfection. However, first lock I got had a broken piece. The replacement lock came with a missing a clip. I WILL NOT PURCHASE ANOTHER DEABOLT FROM MUL-T-LOCK! This is ridiculous!

I'm a retired Police Officer, and in my opinion, these are the best deadbolts on the market. They are made very well and unless your are a locksmith, they are not going to be picked. They cannot be bumped and no one can duplicate the key unless they have the key card that comes with it. The ball bearing in the throw bolt feature makes these one of the most secure deadbolts out there. You cannot get past it without busting the strike box completely off of the door jamb, which won't be easy if you use the 3" screws. If the lock doesn't deter the burglar all together, it'll definitely hinder their plans of quietly breaking into a house. Nothing if completely burglar proof, but this will help make your home as good as it gets. These deadbolts will definitely stall someone from trying to bust in through the door. If you have a window on the door, or a window near the door, make sure to use a security screen to keep someone from just breaking the glass and reaching in and unlatching the deadbolt from the inside. The locks operate very smoothly. I got them for a new home because who knows how many copies of the keys to the existing locks are out there when you buy a previously occupied home?

This Mul-T-Lock MT5+ should be called Mighty Lock. Heavier and stronger lock AND hardware outclass anything else I've seen. Installation into existing deadbolt holes was delightfully simple. It adjusts without fuss to the two standard US predrilled setups using included directions. Plus you cannot get keys duplicated without your own key card. (Don't lose it ) Big upgrade on security and heft with this deadbolt. I'm impressed.

Very happy with purchase, strong solid deadbolt. Installed and added a metal plate for outter opening door, great product! Very smooth opening/closing.

Heavy duty, good looking deadbolt for exterior door. The product came complete, in brand-new condition.

Amazon is making me pay to return. Not happy with this

The lock is adjustable for the two most common sizes. It fit on my new iron security door.