TRIPODS Center Columens Benro AC4 Center Column - Aluminum Benro AC4 Center Column - Aluminum 5 years warranty Availability Product is no longer available Manufacturer Benro Product code 784928 Description The AC4 Aluminum Center Column is the main center column for our 4 series tripods in Aluminum. Sold to your current Benro as replacement or spare component. The column features a 3/8"-16 regular thread for mounting most heads of the tripods.