Features: This set of four 17mm ball adapters offer a general mounting solution for devices, smartphones, and action cameras on motorcycles, featuring strong plastic construction and a 50mm length to secure secure attachment and flexible positioning. Designed with double 17mm ball joints, these plastic adapters are suitable for 17mm magnetic phone holders, mounts, and tablet stands, providing stable support and easy rotation for optimal device stability. Ideal for motorcyclists, cyclists, and outdoor enthusiasts who need versatile and robust mounting option to keep their navigation systems and mobile devices accessible during rides and adventures. Perfect for attaching bike phone holders, car navigation mounts, or map holders on motorcycles, bicycles, or vehicles, enabling adjustable viewing angles for safe and convenient use on the go. An essential accessory for travel and commuting, this multipurpose extender delivers dependable adaptability to securely hold devices in place, enhancing convenience for users of various mounting systems. Specifications: Component : plastic Length: total length 50mm/2inch, middle length 20mm/1inch, ball head diameter 17mm/0.7inch Thread: 1/4 Package Includes: 4x17mm Ball Head Brackets note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.