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.
Raw and Translucent colors may show small veins or patches of surface rust under the finish. This is normal and does not affect the integrity of the product.