You can use these to replace the bottom mount on your new POSP scopes with flat finish or BP-02 AK mount to convert it to SVD and vice-versa. These separate bottom mounts come without pre-drilled "pin" holes since the holes should be drilled AFTER the bottom mount is installed and the scope is zeroed. The user is expected to pin the bottom mount when the exact mounting position is decided. Suitable for converting POSP scopes also. Do not forget to order 4 original screws if yours are shot.