501A - Bright, Fractional, wire & letter sizes

500 - Black Oxide, Metric sizes

501 - Black Oxide, Fractional, wire & letter sizes

6501 - Aircraft, Fractional, wire & letter sizes

6520 - Cobalt, Metric sizes

501P - Tin Coated, Fractional & wire sizes

520P - Tin Coated G Standard, Metric sizes

517P - Tin Coated Parabolic, Fractional & wire sizes

581 - M35 Cobalt Bright Oil Hole, Fractional sizes