Redrock Micro 19mm/15mm Studio Swing-away Arm

hello I am t-bone Pearson and what is this this is a Redrock micro matte box so what would I use this for I would use this on a rail system which I just did a video about it I shall show you really quick hold your horses this is the rail system this attaches at the end of the rail system so the cameras in the middle and this is gives you control so you attach this on to the rail system and you can put in if it's a really sunny day you have these chambers where you can put almost like sunglasses inside so it cuts down your light and gives you more control over your depth of field also if the Sun is going right into your camera you just bend this down and cut off those lens flares unless you're JJ Abrams and you want them in there you can control quite a few things there's these little side pieces that go up and you can control light when you're outside even inside as well and there's two