| Business | Phone |
| C & C Grinding Corp 1685 Austin Dr, Troy 48083 | (248) 689-1979 |
| Extrusion Punch & Tool Co 2326 Alger Dr, Troy 48083 | (248) 689-3300 |
| Oakland Precision Grinding 1935 Bellingham Dr, Troy 48083 | (248) 740-9911 |
| Metro Grinding 1930 Barrett Dr, Troy 48084 | (248) 269-0800 |
| Dynamic Precision Tool & Mfg 1000 Livernois Rd, Troy 48083 | (248) 589-3110 |