| Business | Phone |
| Comco Sheet Metal Co 2306 West St, Oakland 94612 | (510) 832-6433 |
| Hub Associates 8139 Capwell Dr, Oakland 94621 | (510) 633-2000 |
| Mauck Sheet Metal 755 Independent Rd, Oakland 94621 | (510) 638-3607 |
| Nor-Cal Metal Fabricators 1121 3rd St, Oakland 94607 | (510) 836-1451 |