This genuine Stihl 42306407501 worm gear is an authentic OEM replacement component designed for the cutting head assembly of various Stihl HS 81 and HS 86 series hedge trimmers. Manufactured to Stihl's rigorous quality standards, this worm gear ensures precise power transmission and durable operation, critical for maintaining the optimal performance and longevity of your Stihl hedge trimmer. Replacing a worn or damaged gear with this original part restores the tool's efficiency and reliability.