Suitable for Quad Lock Handlebar, Fork Stem and Mirror Mounts, the Quad Lock Motorcycle Knuckle Adaptor can be integrated between the mount and the index head to provide extra height and another level of adjustability when setting your smartphone viewing angle. Compatible with all Quad Lock 360 products. Tech Specs: Glass filled nylon construction Stainless steel hardware. 34.8 mm tall, 25 mm wide. What's Included? Motorcycle Knuckle Adaptor.