The information below is per-pack only 【FOR POWER BANK】Designed to attach a power bank to a camera rig, or a mobile phone rig when a sustainable charging solution is required 【SPRING LOADED CLAMP】It will hold power banks with width range from 53mm to 81mm, which covers most power bank products in the market.Such as fit for Anker,fit for RAVPower, fit for POWERADD, etc 【RUBBER CUSHIONS】Inbuilt rubber pads help absorb shocks and prevent your power bank from scratching 【SAFE INSTALL】 It comes with two 1/4" screws, which can be used to attach the holder to the desired place, and the screw tighten design ensures a more secure and stable clamping of the power bank 【LIGHTWEIGHT AND DURABLE】The holder2790 is made of aluminum alloy and stainless steel, is very sturdy and durable. Moreover, the net weight is only 80g, is lightweight for you to carry around