The STIHL 116657212000 is an authentic OEM adjusting screw designed for fine-tuning the carburetor on a wide range of STIHL power equipment. This critical component ensures accurate fuel-air mixture adjustments, which is essential for maintaining optimal engine performance, fuel efficiency, and emissions compliance. Manufactured to STIHL's rigorous quality standards, this screw provides reliable and durable operation for models such as the FS 80, FS 85, BG 86, MS 250, and MS 260.