SmallRig Clamp-On Ring for Matte Box 2660 (114mm-95mm) 3463 allows you to clamp your matte box to the front of your lens quickly. The adapter ring is compatible with the lens with a Φ95mm front outer diameter. Made of high-strength, durable POM material. The adapter ring features a split design allowing for gentle compression that holds your matte box securely on your lens.