✅ MAKERELE New Work Round Electrical Box 1-Gang 20.3 Cu.in PVC Round Outlet Box with Two Nails for Residential and Light Commercial Ceiling Box ETL Listed 1-pcak: See expert answer to “Which wire gauges fit inside?” →18 cu in size: 7×10 AWG / 8×12 AWG / 9×14 AWG; 20.3 cu in size offers ~12 % more space.