Gitzo Systematic Rapid Carbon Column for Series 3/4The Gitzo Systematic Rapid Carbon Column for Series 3 4 is a valuable accessory for your Systematic tripod. This center column is compatible with Series 3 and 4 Systematic tripods. It's a useful accessory for when you need more height and quick and easy height adjustment. This GS3513S center column replaces the GS3512S. Rapid Column The Gitzo Systematic Rapid Carbon Column for Series 3 4 is a rapid carbon fiber center column for a Series 3 or 4