Come and Check Our Branding Solutions.You can screw the nut to fix the clamp freely, the tighter you screw, the sturdier it will be Its two small arms are just enough to press against the upper and lower vent blades to form a stable triangular structure and lighten the load on the middle one, with no damage to your car. This clip more than 10X sturdier than normal ones. We also have a variety of supports for you to choose from. Make sure you choose the one you like Pls check inventory and detailed info before placing your orders.