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. 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. Manufactured in the USA.