These are manufactured by Febi-Bilstein, the OEM supplier to Mercedes.
T-40Torx head screw, 55mm stretch bolt
Order 1 screw for each injector
These bolts are to be tightened in two stages. Torque to 7 Nm (62 inch lbs), then an additional 90 degrees
Sprinter II 2007-2018 3.0L V6 ONLY
NOT FOR 4 CYL ENGINES
It is critical that new screws and copper seal rings be fitted any time that injectors are removed and replaced. These are the original Mercedes Benz screws and are not a hardened bolt. They are a "stretch bolt" or as more formally known, torque to yield. Do not use any other bolt on your injectors and never re-use an old bolt/screw.