That’s a Chicago Pneumatic CP854 Pneumatic Angle Grinder
It’s the smaller brother of the CP857 you sent earlier.
What it’s used for:
This is an air-powered 4 1/2" angle grinder. It uses compressed air to spin a grinding or cutting disc for precision metal work.
Common uses:
1. Metal fabrication - Grinding welds, smoothing edges, removing burrs
2. Cutting - Cutting thin metal, stainless steel, pipes, bolts with a cutting disc
3. Surface prep - Rust removal, cleaning, polishing metal
4. Auto / Workshop - Bodywork, exhaust work, tight spaces where a big 7" grinder won’t fit