This is the replacement Muffler Extension Screws for the O.S. 1.20 AX muffler extension - OSMG6788. FEATURES: Steel construction, black in color INCLUDES: Two 4x91mm shoulder screws (requires a 3mm hex wrench - GPMR8013) REQUIRES: Installation SPECS: Length: 91mm Diameter: 4mm COMMENTS: For the muffler extension with screws order OSMG6788. kpm01/30/2006 ir/jxs