| Business | Phone |
| Acar Broach & Machine 25300 Groesbeck Hwy, Warren 48089 | (586) 777-0410 |
| Seco-Carboloy Inc 11177 E 8 Mile Rd, Warren 48089 | (586) 497-5000 |
| Cole Carbide Industries Inc 24703 Ryan Rd, Warren 48091 | (586) 757-8700 |
| Invo Spline Inc 2357 E 9 Mile Rd, Warren 48091 | (586) 757-8840 |
| Keo Cutters Inc 25040 Easy St, Warren 48089 | (586) 771-2050 |