1. High compatibility: The suction cup holder comes with 1/4-inch thread, 3/8-inch thread and positioning holes for improve stability and strength. 1/4-inch and 3/8-inch conversion screw holes. Can be attached to for mobile phones, for cameras, for sports cameras, for DSLR cameras, etc. The combination of the suction cup and camera arm allows you to complete the angles of the side, top and interior of the car. 2. High-quality materials: The top of the suction cup is made of aluminum alloy material, which is and has a long service life. The bottom is made of silicone with moderate softness and hardness, which greatly enhances the adsorption force. The suction cup remains stable under high-speed driving conditions. 3. Pressing column: the suction valve repeatedly until the white safety line is completely hidden to fix it, and check whether the suction cup is completely and tightly attached to the sucked object. Easy to release, the air release button to release the suction. 4. Strong suction: The car suction cup mobile phone holder can bear up to 20kg. If the load can reach 20kg, if more suction is needed, you can add a suction cup under static conditions, so that the overall suction increase by 1.5 times. 5. Wide range of uses: The car suction cup phone holder can be firmly fixed on any smooth , such as ships, metal and ceramic surfaces, car windshields, flat glass doors, doors, car hoods, roofs, truck hoods, , etc. Colour:Black Material:Aluminum Alloy Package Contents: 5 x Car suction cup (3 inches) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.