Each lock comes with two keys as standard. Unfortunately, it is not possible to order additional keys for these locks.
However, for models such as
SDL-S2,
SDL-SS1, and
SDL-G2, they feature a detachable lock cylinder. This means that you have the option to replace the existing cylinder with a compatible standard key cylinder. Once the cylinder is replaced, you can have additional keys cut for the new cylinder.
An example of a mechanical key cylinder that you can purchase for this purpose is
BRAVA URBAN HALF EURO CYLINDER (6 PIN) -