The 124 to 114mm Flexible Adapter Ring for Clamp-On Matte Box from SHAPE is compatible with the SHAPE clamp-on (AKSCL) and swing-away (AKSWA) matte boxes. The split design allows a subtle compression that secures the matte box on your lens. Comprised of Delrin plastic, the flexible adapter ring is lightweight enough to enable matte boxes to mount directly on lenses without rods. The adapter supports lenses with a 114mm diameter.