| Business | Phone |
| Synthetic Industries 931 Derby Ln, Howell 48843 | (517) 540-0702 |
| Precise Finishing Systems 1650 N Burkhart Rd, Howell 48855 | (517) 552-9200 |
| M S Machining Systems Inc 5833 Fisher Rd, Howell 48855 | (517) 546-1170 |
| Jernberg Industries Inc 10055 Bergin Rd 11, Howell 48843 | (810) 632-9296 |
| Injectronics 1045 Durant Dr, Howell 48843 | (313) 824-0353 |
| Gilreath Manufacturing Inc 3280 W Grand River Ave, Howell 48855 | (248) 353-4875 |