Featuring a quick lock mounting system that attaches to the front barrel of 114mm lenses the vocas mb 215 matte box kit accommodates filters sized 3x3 to 4x6 with room for 2 filters 1 rotatable and 1 fixed this kit also includes the 114mm flexible cuff ring an anti reflection donut for lenses 50 110mm in diameter and a height adjustable bars adapter for using 15mm rails with the mb 215