KATO CURRENT TRANSFORMER 300:5 RATIO, 1.5 INCH HOLE
  For sale is a KATO CURRENT TRANSFORMER 300:5 RATIO . The hole is appx.
1.5 inches. 
  This part comes from several obsolete motor-generators by Kato
  Industries that we took apart. The machines worked prior to
  dismantling and lived in a nice environment with filtered air, 
  serving IBM minframe computers.