| Business | Phone |
| Wear-Ever Surface Treating 14326 E 9 Mile Rd, Warren 48089 | (586) 778-2330 |
| Vac-Met Inc 7236 Murthum Ave, Warren 48092 | (586) 264-8100 |
| American Metal Processing Co 22720 Nagel St, Warren 48089 | (586) 757-7337 |
| Tri-State Flame Hardening Co 27150 Gloede Dr, Warren 48088 | (586) 776-0035 |
| Steel Processing Co 23605 Groesbeck Hwy, Warren 48089 | (586) 772-3310 |
| Nitro-Vac Heat Treating Inc 23080 Dequindre Rd, Warren 48091 | (586) 754-4350 |
| Nor-Cote 11425 Timken Ave, Warren 48089 | (586) 756-1200 |
| Metallurgical Processing 23075 Warner Ave, Warren 48091 | (586) 758-3100 |
| Induction Engineering Inc 22840 Sherwood Ave, Warren 48091 | (586) 756-4440 |
| Induction Processing Inc 24872 Gibson Dr, Warren 48089 | (586) 756-5101 |
| Induction Services Inc 24800 Mound Rd, Warren 48091 | (586) 754-1640 |
| Kee Services 25120 Easy St, Warren 48089 | (586) 777-6370 |