This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Modification of Equipment: Nonmetallic Crude Materials
Possible NAICS Codes
331491 – Nonferrous Metal (except Copper and Aluminum) Rolling, Drawing, and Extruding
327331 – Concrete Block and Brick Manufacturing