This is the Muffler Assembly Screw for the OS Max E-3030 Muffler. This assembly screw holds the muffler body together. FEATURES: Metal Construction Black in color Phillips/slotted head type INCLUDES: One Assembly Screw One 3.5mm nut REQUIRES: None, item is a stock part SPECS: Assembly Screw Size: 3.5mm x 121mm (4.76"), .6mm pitch (coarse) Length of threads: 21mm (.83") COMMENTS: These do not attach the muffler to the engine, they hold the muffler body together. NNA 12/23/01