This the replacement Muffler Mounting Screws for the O.S. 1.20 AX engine - OSMG0650 and OSMG0651. These screws are used to mount the muffler if you are not using the muffler extension - OSMG6788. FEATURES: Steel construction, black in color INCLUDES: Two 4x45mm shoulder screw (requires a 3mm hex wrench - GPMR8013) REQUIRES: Installation SPECS: Length: 45mm Diameter: 4mm