17mm to 25mm Aluminum Socket Arm: Designed for ram mount b size 1 inch ball mount, connects with standard 17mm/0.67 ball head, such as automotive suction cup holder, vent holder, dashboard holder and GPS holder, etc., providing you with solutions for different devices. ALUMINUM ALLOY MATERIAL: This 17mm-25mm Double Socket is made of high-quality aluminum alloy material, using high-precision CNC machining, to ensure the exquisite appearance in addition to the ruggedness and durability, long service life, to provide stable support for your equipment. INNOVATIVE CONSTRUCTION: Unlike traditional connecting rods, this connector adopts a split 360° rotating structure, which provides a more convenient and solid solution for connecting your car, bike and so on. EASY TO INSTALL: Separate 17mm (0.67 inch) and 25mm (1 inch) ball joints, you just need to loosen the knob corresponding to the interface, install your ram type bracket, complete your work needs! LIGHTWEIGHT AND SOLID SOLUTION: Weighing only 113g, it is suitable for smartphones, smart devices combined with cars, boats, bicycles and other transportation, and you can use it with any 17mm and ram b size accessories.