The vocas mb 255 matte box kit with 15mm rod support 144mm is used on the end of a lens to block the sun or other light source in order to prevent glare and lens flare the mb 255 matte box accommodates filters from 3x3 up to 4x6 and has been specifically designed to work with lenses that have a front side diameter of up to 114mm such as the zeiss cp2 lenses this kit includes the mb 255 matte box kit 114mm flexible cuff ring and a height adjustable bars adapter