Cross Head for Delta or Rockwell 24 Inch Scroll Saws with Serial #CS-1394 or earlier. Use with the 430-02-310-0001 Square Slide Block. The Cross Head part #430-01-355-0001 for later Models, Serial #CS-1395 and higher is also available. The Round Slide Block is part #430-01-071-0003, also for Serial #CS-1395 and higher.