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 includes all that is needed, from top to bottom: arm, arm friction collar, 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.