These locks work well with Waze chains and illuminates the need for two keys. They are very durable locks but the paint cans to peel off easilyThis lock is fairly small but works great. Handcuffs keys smoothly and easily open the lock. Nice to keep these on the side yard, as police/firefighters can access your backyard easily if they ever need too.This padlock is great. When you need a number of padlocks keyed alike and keys available for multiple people at a time this is a great choice. Though there are handcuff keys out there (which limits some security) not many outside of law enforcement carry them at all times to take advantage of the situation. I use them for low level security for pelican cases on the job site. If someone looks and realizes what key this lock uses and they have the key with them it doesn't do much but playing the odds I have done ok so far and have put in multiple orders to stock up. My cases are only unsupervised for small periods normally but have expensive equipment to protect when unsupervised. In reality most locks this size aren't much more secure though having different keys.LoveNot much to write. Doubt that it is very secure to lock picking, doubt the base of the lock is too strong,but overall it's all sufficient for locks price.The real disadvantage I've experienced - the orange paint layer started to fall off in small pieces.Must have been really cheap paint.Heavy duty, bright and durable; This lock is easy to use and manipulate. It is nice that you can use a universal handcuff key for it. I bought this with the intention of using it for prisoner transports to and from medical facilities which require lifting or separating the hands from the mid section (not accomplished with standard belly chains) - I haven't attempted to Vet it yet by defeating or picking the locking device but over all this has every bit as great of qualities as a standard high security lock.Small, light , tight quality. It's perfect for what I need it for. I wouldnt suggest using this lock for something that's unattended for long periods of time due to the fact anyone can buy a cuff key and can be shimmied although extreamly difficultSeems like a quality product. Bought it to use with a set of California cuffs with belly chain