Features: This 15mm double hole rod clamp allows for quick connection to conduit through hand tightened screws, making it easy to attach external devices. The railblock rod clamp features multiple 1/4 threaded holes, 6.5 through holes, 1/4 cups head holes, providing ranges of expansion option for external equipment. Made from aluminum, this camera rod clamp is withstands heavy use while maintaining its functionality and structure. This Rig Shoulder Support Rail can easily fit into various setups without taking up too much space. Each package comes with rod clamp, providing you with everything you need for your conduit connection needs Specifications: Component:Aluminum Color:Black/Redness Size:Apporx.1.7x10x2.50cm/0.67x3.93x0.98inch Package Includes: 1Pc Rod Clamp note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.