This genuine Stihl fastener provides a secure hold for key equipment components, providing optimal performance. Part number 9022 371 1020 has a unique spline head requiring a specialized screwdriver for tightening. This spline screw has a 5mm M5 thread, is 20mm in length and is for use on many types of Stihl power equipment including chainsaws, concrete cut-off saws, leaf blowers, grass trimmers, hedge trimmers and more.