| Business | Phone |
| Gem Industries Inc 4045 Korona Ct Se, Caledonia 49316 | (616) 656-9779 |
| J & J Engineering & Machine 3265 68th St Se, Caledonia 49316 | (616) 554-3302 |
| X L Engineering 6950 Hammond Ave Se, Caledonia 49316 | (616) 656-0324 |
| Micro Manufacturing Inc 6900 Dutton Industrial Park Dr, Caledonia 49316 | (616) 554-9200 |