They are print driver and utility installer kits for the LaserWriter Pro 810. Both of these utilities are also included with the LaserWriter Pro 810 on 3.5-inch floppy diskettes (the UNIX utility is on a tar formatted-diskette and the VMS floppy is on a MS-DOS-formatted diskette).
Apple created these utility kits, because some VMS and UNIX systems require tape-based instead of floppy-based software.
The VMS Network Utility is shipped on a TK50 tape, while the UNIX Network Utility is shipped on a QIC24 tape.