Set of 3 lens mount adapters and a case. PENTAX M42 - Included: 3 lens mount adapters, with case - Model Number: S3 N°I - Model Number: S3 N°II - Model Number: S3 N°Ⅲ Intermediate ring set for M42 mount With case These are quite old. It seems my uncle bought them when he was young. There are no noticeable scratches or stains. They were kept in a leather case, so the storage condition was good. The inside leather surface of the case shows signs of use. There are no issues with the screw threads.