Lock protection for a cylinder lock for a door, which lock protection is configured to protect a lock cylinder (20, 22) which, in a mounted state, partly can protrude from the door surface, wherein the lock protection comprises: a first part which has a first side, which in a mounted state lies outside the door surface, a second side, which in a mounted state lies in the door, and a substantially cylindrical outer surface which connects said first and second sides and which in a mounted state to a considerable extent lies in a hole in the door, but which at the end nearest the first side protrudes from the door, wherein said first part has a first recess, with a cross-sectional dimension adapted to receive a lock cylinder (20, 22), which recess extends from the second side towards the first side but not all the way to the first side, but where a first hole which has a smaller cross-sectional dimension than the first recess and than the lock cylinder (20, 22), extends from said first recess out through the first side, wherein the first hole is configured such that in a mounted state a key via the first hole can interact with the lock cylinder (20, 22) which is positioned in the first recess, either in that the key is inserted into a keyhole in the lock cylinder (20, 22) or in that the key in another manner communicates with the lock cylinder (20, 22), a second, substantially ring-shaped, part with a substantially round second hole which is adapted to said substantially cylindrical outer surface of the first part, wherein the second part is configured to be able to be moved to different positions along the substantially cylindrical outer surface, wherein the first and second part are configured to interact with blocking means which is adapted to lock the second part, relative to the first part, in a selected position, wherein the second part comprises a surface which in a mounted state is configured to, directly or via one or more further elements, abut against the door surface around the hole in the door, wherein the first part comprises a third hole or a recess and wherein the second part comprises a fourth hole or a recess, wherein the lock protection is configured to interact with said blocking means in the form of a body which is configured such that it, in a blocked state, extends from said third hole or recess in the first part to said fourth hole or recess in the second part for locking the second part relative to the first part by extending into both said third hole or a recess and said fourth hole or recess, and wherein, by selecting a suitable position where the second part is locked relative to the first part, it is determined how much the first recess, and thereby the lock cylinder (20, 22), in a mounted state is to protrude from the door surface. a first part which has a first side, which in a mounted state lies outside the door surface, a second side, which in a mounted state lies in the door, and a substantially cylindrical outer surface which connects said first and second sides and which in a mounted state to a considerable extent lies in a hole in the door, but which at the end nearest the first side protrudes from the door, wherein said first part has a first recess, with a cross-sectional dimension adapted to receive a lock cylinder (20, 22), which recess extends from the second side towards the first side but not all the way to the first side, but where a first hole which has a smaller cross-sectional dimension than the first recess and than the lock cylinder (20, 22), extends from said first recess out through the first side, wherein the first hole is configured such that in a mounted state a key via the first hole can interact with the lock cylinder (20, 22) which is positioned in the first recess, either in that the key is inserted into a keyhole in the lock cylinder (20, 22) or in that the key in another manner communicates with the lock cylinder (20, 22), a second, substantially ring-shaped, part with a substantially round second hole which is adapted to said substantially cylindrical outer surface of the first part, wherein the second part is configured to be able to be moved to different positions along the substantially cylindrical outer surface, wherein the first and second part are configured to interact with blocking means which is adapted to lock the second part, relative to the first part, in a selected position, wherein the second part comprises a surface which in a mounted state is configured to, directly or via one or more further elements, abut against the door surface around the hole in the door, wherein the first part comprises a third hole or a recess and wherein the second part comprises a fourth hole or a recess, wherein the lock protection is configured to interact with said blocking means in the form of a body which is configured such that it, in a blocked state, extends from said third hole or recess in the first part to said fourth hole or recess in the second part for locking the second part relative to the first part by extending into both said third hole or a recess and said fourth hole or recess, and wherein, by selecting a suitable position where the second part is locked relative to the first part, it is determined how much the first recess, and thereby the lock cylinder (20, 22), in a mounted state is to protrude from the door surface.