I have it in storage right now, so I cannot say what model it is. The arms are not made of Aluminum but made of I think is 14 gauge sheet metal. Were the two arms come together there is a plastic band that you squeeze that lets you slip one arm into the other. There is no lifting the arm to latch it in the top of the arms. You depend on the ratchet on the awing drum and the plastic strap to keep it together while you drive. How ever owned my rig before used a small bungy to help hold then together. One advantage to it, it is light and easy to move.