New & improved Steel inner locking mechanism Compatible with all Baja mini bike models Works on ATVs, dirt bikes, & power generators Gas tank cap (fuel cap) compatible with some Baja ATVs and Baja Mini Bikes including the Doodle Bug 97cc series (DB30) and Baja Mini Bike MB165 & MB200 (Baja Heat, Mini Baja, Baja Warrior) This is the later improved version Gas tank cap (fuel cap) compatible with some Baja ATVs and Baja Mini Bikes including the Doodle Bug 97cc series (DB30) and Baja Mini Bike MB165 MB200 (Baja Heat, Mini Baja, Baja Warrior). This is the later improved version. This fuel cap has a polished chrome outer shell and plated steel inner locking mechanism. Outer dimension is approximately 2-3/4″ (71 mm) in diameter. The inside black gasket diameter is approximately 57 mm. The inside steel plated tabbed circular metal diameter is 38 mm. The inside flat tabbed end to end distance is about 47 mm. Also compatible with many other Chinese made gas dirt bike