| Business | Phone |
| G & C Machining 1844 Mayer Rd, Columbus 48063 | (810) 326-0311 |
| Geo-Metric Machining & Design 2594 Palms Rd, Columbus 48063 | (586) 727-9119 |
| Machin-A-Mation 8520 Division Rd, Columbus 48063 | (586) 727-5200 |
| Proto-Form 10312 Gratiot Ave, Columbus 48063 | (586) 727-9803 |
| Pyramid Tool Co 8860 Crawford Rd, Columbus 48063 | (586) 727-3451 |