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