Product description Size: length 50mm (adjustable to 100mm), width 50mm, clip diameter 31.8mm Color: red, black, silver Material: aluminum alloy Package content: 1pcs mobile phone holder. 1.Material upgrade: stronger and more durable It is made of aluminum alloy and processed by the CNC technology, connected by stainless steel screws. Higher intensity, no tremors or tremors, no unusual sound. The surface is anodized, not easy to fade and more beautiful. Quality, strength and durability are much better than plastic and silicone cell phone holders. 2.Reliability upgrade: stronger and more reliable Use the telescopic arm to hold the left and right side of the smartphone. The back of the cell phone holder has locking screws that lock the telescopic arm firmly in place. In addition, you can also use a silicone frame to hold the four corners of your smartphone, under the violent shocks the smartphone will not be loose. Double Fixed, 0% drop rate, very strong. 3.Structure upgrade: Easier to use Fixing or removing the phone is quick and easy, the process only takes 3 seconds. Save 2/3 the time compared to the traditional method. The metal rotating mechanism is firm and reliable , can rotate 360 freely, and is flexible and convenient to use. 4.ADJUSTABLE WIDTH Compatible With Most Mobile Phones, GPS, you can adjust the width from 50mm to 100mm to fit the cell phone.Can hold 4 to 7 inch phones 5.MORE STRONG Aluminium Alloy Material with Sponge,The metal phone mount will hold your cell phone tightly on the bicyclethe Sponge also protect your cell phone.