The 2-Stage Clamp-On Zip Box (80-85mm) from Wooden Camera is a lightweight matte box/sunshade. It holds up to two 4 x 5.65" filters and will fit lenses with a front diameter of 3.1-3.3". Flex the rubber body to snugly fit around the filter(s), then tighten the thumbscrew to clamp the Zip Box onto the lens. Its wide design prevents vignetting even when used with wide lenses and large camera sensors. This matte box features a durable, unibody rubber design and stainless steel hardware.