With Boss: Arm has welded bolt boss for Bolt Drive sprockets. Left Arm with boss for Left Hand Drive or Right Arm with Boss for Right Hand Drive. (10.2oz)
No Boss: Arm has no bolt boss for a clean look and weight savings, for Spline Drive sprockets or Non-Drive side. (9.8 oz)
Made in the USA.
This product was added to our catalog on October 24, 2019