Richard Wheatley Tube Fly boxes hold tube flies securely without damage to the dressings. There is a choice as to which way the bars run on the foam boxes (horizontal and vertical). 6" Aluminium Fly Box with a choice of Silver or Black finish. Holes are approximately 2mm in diameter however they will stretch to take larger tube flies. In general, the horizontal boxes have 52 holes (13 on each side) and the vertical boxes have 32 holes (8 at each end).