| Business | Phone |
| Sturdy Broaching Svc 27711 College Park Dr, Warren 48088 | (586) 779-2243 |
| Flex Slotter Inc 3462 E 10 Mile Rd, Warren 48091 | (586) 756-6444 |
| Metro Broach Inc 2160 E 9 Mile Rd, Warren 48091 | (586) 758-2340 |
| Hines Manufacturing Co 21887 Schoenherr Rd, Warren 48089 | (586) 775-1200 |