Andoer Universal Tripod Extension Arm Aluminum Alloy Detachable Extender Horizontal Centre Column for Tripod 48-106cm Retractable Tripod Boom Arm with 360° Rotatable Base 5kg Load Capacity - Walmart.com
Tripod Extension Arm,16.5" Horizontal Center Column Tripod Extension A – koolehaoda
MANFROTTO 131DB REVIEW horizontal center column - YouTube