The studs are screwed into the body of the STIHL chainsaw and hold the bar and the clutch cover. The mounting nuts thread onto them. Manufacturer: STIHL.
Replace them if the thread is stripped, or they are bent or cracked: the bar will not be held well. Choose by the length and thread of your saw.
After replacement, check the unit at idle and under load: there should be no leaks, play or unusual noises.
