Subframe bolt from the G80 G81 G82 G83 G87 M2, M3 and M4.
Also fits F80 F82 F83 F87 M2 M3 M4
The G8x subframe bolts are just a little smarter than the OEM F8x subframe bolts. These bolts have a channel for water to drain away that can accumulate in this cavity through the top.
On the F8x, this can cause bolts to corrode because this water cannot get away. With these bolts, problems can be prevented.
Subframe bolts should be replaced during assembly disassembly.