That’s a *Jetchisel Pneumatic Needle Scaler* - air-powered surface prep tool. Box says "PNEUMATIC NEEDLE SCALER" and you’ve got 19 steel needles in the front.
*What it’s used for:*
1. *Rust + paint removal* - Ships, tanks, steel structures, weld prep. The needles hammer thousands of times/min to chip off rust, scale, slag, old paint without grinding.
2. *Tight spots* - Way better than a grinder in corners, pipes, and uneven surfaces. Won’t gouge the base metal like discs can.
3. *Runs on air* - Connects to your petrol air compressor from earlier. So compressor + scaler = full field prep kit.
*Safety:* Loud + vibrates. Ear protection, gloves, and goggles are a must.