Manufacturer BLMHTWO. Mounting Type Adjustable Screw-based Clamp & Spring-loaded Clamp. Mounting type Adjustable Screw-based Clamp & Spring-loaded Clamp. Product Features Flexible, Portable. 【Stable and Secure】The clamp on our phone holder is adjustable via a screw knob, ensuring that your phone stays securely in place without any wobbling or slipping.