DESCRIPTION FRACTIONAL METRIC
AIRCRAFT COUNTERBORES    
     3 Flutes (Similar to Craig 850 series) 522
STRAIGHT SHANK COUNTERBORES    
     4 Flutes 512 512
     3 - 4 Flutes 514 514
     3 - 4 Flutes - For Steels 510 510
TAPER SHANK COUNTERBORES    
     4 Flutes 518 518
     3 - 4 Flutes 516 516
     3 - 4 Flutes - For Steels 511 511
STUB LENGTH COUNTERBORES    
     Pin Drive - For Non-Ferrous & Cast Irons 573
     Pin Drive - For Steels 574
     Stub Taper - For Non-Ferrous & Cast Irons 575
     Stub Taper - For Steels 576
     Radial Drive - For Non-Ferrous & Cast Irons 577
     Radial Drive - For Steels 578
CAPSCREW COUNTERBORES    
     Straight Shank - For Non-Ferrous & Cast Iron 513 513
     Straight Shank - For Steels 515 515
PILOTS    
     Short Shank 500