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The module parts are made from from 7075 military grade Aluminum and the arm is 303 Stainless steel. This is the complete arm module assembly with the arm. It contains from top to bottom, all that is needed: The arm, the arm collar, the arm clutch "O" rings, both inner and outer sleeves, the ball bearing and retainer ring set. This is a USA made replacement.
Available with a black or polished aluminum collar. Each part is also available sold separately.