The CAST ALUMINUM version is identical to the Nylon version, except for material. Aluminum was used for the initial development of the product and was found to be an over kill for the application. The FlagPole Buddy was designed to split the pole torque stress by holding it in two locations. This greatly reduces the stress in each mount, thus allowing the use of materials other than metal. The Patented Upper Mount allows the pole to be inserted from the ground and hold the pole. So the system performs equally in either material.The kit comes complete with everything you need to fly the American Flag, even the Flag!Included in the kit is:~ Upper and Lower Mounts, including Nuts & Bolts~ 6 – 12 ft Telescoping Pole~ Flag Attachment Clips~ Gold ball top ~ 3’x 5’ American FlagEasy one time assembly to RV Ladder ..................... using a 7/16" socket.