Ordering by number: this is 9232210291, the Atlas Copco roller retaining set. This acts as a detent or bearing element in the assembly.
The published breakdown lists it on the Cobra Combi Gas Breaker/Drilll- before 2010 and Cobra Combi Gas Drill/Breaker. Check it against the reference number on the diagram first; serial breaks change what fits.
If you need the parts around it, the parts diagram hub has the full breakdown library, and the Atlas Copco catalog covers the machines themselves. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: 9232210291
- Manufacturer: Atlas Copco
- Crowder SKU: AC-9232210291
- Listed on breakdowns for: Cobra Combi Gas Breaker/Drilll- before 2010, Cobra Combi Gas Drill/Breaker

