High quality and mechanical brilliance, made of high-quality zinc alloy (adhesive part) and stainless steel (ring clamp part). The mobile phone ring holder has unparalleled durability and can remain intact even in case of fall damage. The surface of the circular holder is vacuum ion plated to protect it from oxidation and maintain its surface luster. The edge of the ring handle has been carefully polished to protect your fingers. The robust adhesive strip uses super strong 3M VHB tape, and this mobile phone finger holder can be securely attached to your smartphone (can withstand a 5 kg gravity test) to protect your device from accidental drops and slipping. 3M tape can be applied to various surfaces, such as silicone, rubber, and leather. The 360° rotatable and 180° adjustable phone holder can rotate 360 degrees and fold 180 degrees, so you can always place your phone in the best viewing angle. This circular handle has been tested to fold 6000 times without loosening. Metal plates are the best