If this is locked from the inside with a key, can it be unlocked from the outside with a key?

Yes. Locking the inside just prevents the door being opened from the inside without the key. It makes no difference to opening with the key from the front. Note that the latch bolt can't be opened using credit card or similar, as the latch is locked in place when the door is closed.

Is this suitable for outside use?

Having fitted the lock to an internal front door, I would say it is suitable for only indoor use. I used it for the main door to an apartment in a apartment block, so when I say its not suitable for outdoor, thats in regards to weather etc. It does appear suitable for a front door though.

What exactly makes this lock high security compered to lest say era traditional door lock 60mm? does the lock have anti drill pins/security pins?

Hi BenThe answer to your question is yes! It's very hard pins, five of them from memory possibly 6 this also makes it very, very difficult to pick. It is also anti credit card, and comes with a lock on the inside so it can't be used as an escape route by intruders? As it happens my son locked me out, and I was not willing to break the very old glass in the door,he call out a lock Smith.He was unable to pick it and it took him an hour to drill it out. He was very impressed with the lock. My son wasn't as he got the bill plus, the new replacement lock.

Is it true that when i'm out, a person could smash the window and press the latch down to open this?

Is this the only lock you have?. I have a 5 lever Mortice deadlock as well. The answer to your question will be “ yes” otherwise. Be mindful that if you ever have to call the locksmith to open your door, with the system they use to open it the latch will probably end up “ slightly “ damaged and breaking a few days later ( my own experience twice!).

Manufacturer	Era Locks
Part Number	193-31
Product Dimensions	6.07 x 3.63 x 6.81 cm; 750 g
Item model number	193-31
Colour	Gold
Finish	Brass
Material	Brass
Shape	Rectangular
Item Package Quantity	1
Number of Pieces	1
Special Features	Key Unlock
Included Components	Key, Lock
Batteries included?	No
Batteries Required?	No
Battery description	Not Included
Item Weight	750 g

LocksERA 193-31 60mm High Security Nightlatch with Brass Effect Body

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