The Gitzo GS3513S Systematic Rapid Center Column is a tripod accessory for professional photographers who require secure, additional elevation and rapid height adjustment without adding extra weight to their gear.This carbon fiber rapid centre column is compatible with Series 2, 3 and carbon Series 4 Systematic tripods. The ''rapid'' column slides freely and quickly in the tripod shoulder and is locked and unlocked via a simple twist mechanism, offering the same strength and solid locking under heavy loads. The safety catch feature, when used together with recent Systematic tripods with a safety button, prevents the column from dropping out of the tripod even if it is inadvertently left unlocked. GS3513S replaces the GS3512S, and features the latest components including the solid upper disc and hook