STIHL Genuine 066, MS660 Cylinder Screws # 9022 371 1350

4 x RIBE (German made) M6 x 25 Torx Head Screw of Grade 10.9
Used to hold the Cylinder on many of the STIHL saws all the way up to the MS880. In addition these have the special serrated base that grips the cylinder when they are tensioned