• 29 Piece Cryo- Nitride Drill Bit Set
• Nitride Case Hardened to 70 Rockwell C
• Frozen to -300° to bring the retained austinite to the surface
• Ultra Dex / 3 flats on shanks 3/16" and larger
• Made In USA
Cryogenic treatment creates a more uniform “grain” structure by transforming retained austenite into martensite. Modifies the carbon micro-structure through precipitation of carbides increasing resistance to wear. Nitride process diffuses nitrogen into the surface to create a case hardening resulting in superior tool life and exceptional corrosion resistance.
Includes: 1/16" - 1/2" by 64ths