This four-section bar extends to 12' (3.6m) & is for the Calumet background support. The 4 section bar can be used with all 4 sections together to create the maximum width of 12', or remove sections to create a narrower width. The cross bar can also be configured for smaller size areas or subjects. Connecting only the two end sections will accommodate smaller backrounds up to 72” wide. Please note: Spare part for Calumet Background Support Kit. May not fit onto third party light stands.