1. The holder features a spring loaded clamp,securely holds your battery pack,Firmly secure your SSD on your camera cage,Compatible with width ranging from 55mm to 80mm, which covers most in the market. 2. The clamp comes with two 1/4inch screw for quick installation, which can be used to attach the holder to the desired place . The holder comes with multiple rubber pads inside,which can protect your or other equipment from scratching, wear and tear and not easily slip. 3. WITH 1/4inch SCREW HOLES FOR EXTENSON USE:The clamp reserved 1/4inch screw holes for function extensions. for installing microphone,field monitor speedlite, panel light, and more p ographic accessories, easy for outdoor or any video . 4. Holder for portable power is designed to attach a power bank to the camera rig when a sustainable charging solution is required,so you can power it for extended periods of time. 5. It is made of aluminum alloy, is very sturdy and . Moreover, the net weight is only 105g, so by itself it 't significantly add to your rig's weigh. Item Weight: 105g Compatibility:Portable chargers with width range 55mm -85mm Color: Black Material: Aluminum Alloy Package Contents: 1 * Adjustable Power Bank Clamp Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.