i want to be able to unlock this from the inside - is that possible?

Yes you can unlock the Asec garage door lock from the inside the key fits from the outside and from the inside

Is lock compatible with roller garage door?

The lock will stop the door from moving in whichever direction (i.e. for an up and over door they essentially stop forwards and backwards movement, whereas for a roller garage door they will up upwards - and downwards - movement. Hence you could get creative and have more stops to stop the roller door at different heights).

what diameter is the actual bolt please?

From recollection I guess the actual bolts to be between 12 and 15mm but, due to the nature of the locks, they are good additional security for garage doors. Maybe buy them first and then buy the drill bit needed for the bolts, if that's the issue. I love these bolts as a good addition to customers' garages.

Manufacturer	Asec
Part Number	AS1997
Product Dimensions	22.99 x 20.81 x 3.19 cm; 635 g
Item model number	AS1997
Colour	Black
Style	Modern
Finish	Brushed
Material	Metal
Shape	Rectangular
Item Package Quantity	1
Number of Pieces	1
Measurement System	Metric
Special Features	Internal or externally operated locks
Included Components	1 x Asec Garage Door Lock
Batteries included?	No
Batteries Required?	No
Item Weight	635 g

Asec

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