7075 T-7 aluminum construction and re-designed pin taper set this screw apart from the competition The inventor of the easy-adjust fuel screw and Moose Racing brings you this needed accessory Adjust your carb for better off-idle acceleration with just your fingers Includes O-ring, washer, and heavy-duty spring Fits Keihin FCR carbs on modern machines Made in the USA. SCREW FUEL MIX RED