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twist drills /  high speed steel (HSS)
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Triumph Twist Drill USA
  Made in USA     
 
drill series   length type   material
 
T1 fractional 1/64" - 1/2"   jobber   bright finish HSS
T1C fractional 1/64" - 1/2"   jobber   bright finish M42 cobalt
T2 wire gauge sizes #1 - #80   jobber   bright finish HSS
T3 letter sizes A - Z   jobber   bright finish HSS
T6HH fractional 3/64" - 1/2"   6" aircraft   black oxide finish HSS
T12HH fractional 3/64" - 1/2"   12" aircraft   black oxide finish HSS
T9 fractional 33/64" - 1"   Silver & Demming   Polished flute HSS
MM1 metric 1mm - 13mm   jobber   bright finish HSS
 
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