| Business | Phone |
| Built-Rite Tool & Engineering 3763 Lapeer Rd, Port Huron 48060 | (810) 966-5133 |
| Diemould Tooling Svc-Usa Ltd 1605 Beard St, Port Huron 48060 | (810) 985-8025 |
| Holzberger & Sons Tool & Mach 2724 Yeager St, Port Huron 48060 | (810) 982-3228 |
| Tooling International 3620 Military St, Port Huron 48060 | (810) 985-7968 |