Knife Lock (Gib) Bar also 418-03-004-0001. Uses four Special Screws # 901-09-070-6120. Used on Delta or Rockwell 6 Jointer Models: 37-207  37-220  37-307  37-255  37-260  37-207  37-220  37-221  37-222  37-223  37-225  37-230  37-231  37-233  37-241  37-243  37-307  37-600  37-608  37-610  4800  666