This 29 pc. drill bit set is very proudly made in the USA. This is Norseman Drill & Tools HSS Heavy-Duty CN-TECH Drill Bit Set. These are ‘Jobber Length’ straight shank with three flats drill bits in a really nice round red ultradex thermos type case that makes finding and returning each bit really easy. This set is 1/16″ to 1/2″ by 64th’s.
Why Choose CN-TECH?
Substantially longer cutting life – Superior to Cobalt bits, ultra hard, super premium drill bits that are designed not to snap and shear during hard drilling, even at awkward angles.
Cuts harder materials – The flatter point takes a smaller chip. More torque is directed to a smaller area. This allows drilling into materials with hardness of over 30 on the Rockwell “C” scale.
Stops drill walking – The split point design gives accurate starting without the use of a center punch.
The Nitride process – Diffuses nitrogen into the surface to create a case hardening resulting in superior tool life and exceptional corrosion resistance. Recommended for work hardening grades of stainless steel and other hard metal drilling application.
Cryogenic treatment – Creates a more uniform “grain” structure by transforming retained austenite into martensite.
Runs cooler, uses less torque – 135° point takes a smaller chip resulting in less heat. Friction is reduced by surface treatment.
Type 190-CN HSS CN-TECH
Jobber Length 135˚ Split Point CN-TECH Cryogenic Nitrided
• Nitride coating creates a surface hardness to 70 Rockwell C, exceptional corrosion resistance and heat.
• Cryo Treatment increases toughness while reducing brittleness.
• Replaces cobalt drills when drilling series 300 & 400 stainless steel.