【lifetime warranty】This phone holder offers lifetime warranty, if you have any questions, please feel free to contact me, we will provide you with the best solution within 24 hours, 【Phone Holder + Dual Socket Arm】 This kit includes our universal phone holder (opens to 3.4 inches wide) and our sturdy 15mm aluminum Double Socket Arm（Long Arm） 【Expandable to 3.34 inches】This phone holder assembly is compatible with B size ball head, can freely match and connect to more devices, phone clip width is 2.55" (65mm) to 3.34" (85mm), can support up to 14mm thickness of the device, suitable for 5.5-7 inch phone without picking the model , 【Dual Socket Arm】 The Socket Arm can be installed with 1" ball, You can connect other devices with 1" balls through this product, and freely match them according to your needs. 【high quality】This cell phone holder made of aluminum alloy, the surface of the three-stage hard anodizing treatment, higher strength corrosion resistance, not easy to damage, 304 stainless steel ball head wrapped in frosted anti-slip rubber, to ensure that the material is strong at the same time, both anti-slip wear-resistant characteristics, long-term suitable for RAM mount phone holder, motorcycle phone holder, bike phone holder. This kit includes our universal phone holder (opens to 3.4 inches wide) and our sturdy 15mm aluminum Double Socket Arm，This phone holder assembly is compatible with B size ball head, can freely match and connect to more devices, phone clip width is 2.55" (65mm) to 3.34" (85mm), can support up to 14mm thickness of the device, suitable for 5.5-7 inch phone without picking the model ,The Socket Arm can be installed with 1" ball, You can connect other devices with 1" balls through this product, and freely match them according to your needs.This cell phone holder made of aluminum alloy, the surface of the three-stage hard anodizing treatment, higher strength corrosion resistance, not easy to damage, 304 stainless steel ball head wrapped in frosted anti-slip rubber, to ensure that the material is strong at the same time, both anti-slip wear-resistant characteristics, long-term suitable for RAM mount phone holder, motorcycle phone holder, bike phone holder.