The lexicon of the top500 ( The Encyclopedia for Classification Codes ) explains the codes and definitions in the world of economical classifications.
NAICS Code 3322 Cutlery and Handtool Manufacturing
The NAICS Code 3322 is described as
Cutlery and Handtool Manufacturing It belongs to the code group
NAICS Code 332 Fabricated Metal Product Manufacturing
To this Code "3322" belongs the sub codes
NAICS Code 33221: Cutlery and Handtool Manufacturing