Item Type: 3 Section Tripod Extension Arm Weight: 200g/7.1oz Material: Aluminum alloy Number of Sections: 3 Product Pipe Diameter:2.5 cm /0.98in, 2.2 cm /0.87in, 1.9 cm /0.75in Maximum Length: 458mm/18in Minimum Length: 215mm/8.5in Package List 1 x Extension Rod 1 x Screw 1 x Wrench 13 Section Center Column Extension Rod: The shaft can be installed on the tripod without the shaft, extending the height of the tripod to photograph more scenery. Used for most tripods to increase tripod height. 2Easy Switching: The top panel is loosened to the right, screwed to the left, and can be easily converted between 1/4 inch and 3/8 inch screws, suitable for more devices, such as: head, stabilizer, phone clips, cameras, etc. 3Aluminum Alloy Material: CNC anodizing treatment, rich texture, compact and portable, durable, strong bearing capacity. 4Retractable Design: 3 section retractable design and rubber adjusting knob are used to meet the shooting needs in different scenes. 5Bottom to Tripod: The bottom 3/8in threaded hole can be connected to the tripod by distributing 3/8in to 1/4in screws, suitable for most tripods on the market, and easy to increase the height of the tripod or monopod.