Shackle – A high-security shackle should incorporate ball bearings and should release on both sides to deter cutting.
Shroud – The shackle cover or shroud should be made of multiple layers of strong metal. These extra layers of protection will force the thief to cut through them, buying time.
Core – The core of a high security lock is a pivotal piece. The pins should be made of a strong material, and it’s a plus if the core can be removed and modified with a stronger one of your personal preference. A high security lock should have multiple mechanisms that resist the lock being compromised.
Anti Drill Plate – An anti-drill plate prevents drills from boring into the metal of your lock. There are many different ways that a plate can do this, but overall the drill bit either needs to be deflected or of a metal too soft to penetrate.
Metal – Of course, the better the metal that goes into a lock, the better the security will be. If only we could afford locks made of diamonds – security would never be an issue! The thickness of the metal matters too. You can get a lot more strength out of an alloy, and the thicker the better.
The range of prices is pretty wide on this list. Of course you get more by spending more money. However, there are some pretty good contenders all across this list. Do a little research.