Hi,
I've used Avocet ABS locks throughout.
They were easy to specify, you take the measurement of the existing euro-barrel lock and the distance to the fixing hole.
They also supply keyed alike padlocks.
They are expensive, but when you consider they are the first line of defense to your home, the added security seems justified.
I hope that helps.
Our local locksmith "keyed" a lock so that our main door key opened the new lock. I think he chnged the little pins inside, so I guess they can just key some to your needs.
Despite the different makes of lock, they all have a "Eurocylinder" which is a standard fitting.
Different brands and levels of security are available, but they should all fit.
The length varies, and you should get the shortest that fits. If there is a long protruding snout it is easier for a burglar to break it off and enter your home.
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