Lens support telephoto bracket 15mm rail block clamp is made of aluminum.,You can vary the height of the support by the adjustable knob in the middle, until it meets the lens.,Standard 15mm diameter 60mm distance between holes rail rod clamp allow you to mount it on rails of any 15mm rail rig.,The interface comes with the rubber gasket which protect your lens from danger.,This Lens support system is perfect for long lenses and is compatible with any industry-standard 15mm rod system, creating a more stable, vibration-free platform for .,Lens support telephoto bracket 15mm rail block clamp is made of aluminum.,You can vary the height of the support by the adjustable knob in the middle, until it meets the lens.,Standard 15mm diameter 60mm distance between holes rail rod clamp allow you to mount it on rails of any 15mm rail rig.,The interface comes with the rubber gasket which protect your lens from danger.,This Lens support system is perfect for long lenses and is compatible with any industry-standard 15mm rod system, creating a more stable, vibration-free platform for .