You have seen it (or a prototype of it) in fly tying videos. You have called and emailed OPST and asked about it. And now it's here: the OPST Shank Chuck Tool. It took OPST a long time to dial this one in. The challenge was first to make a tool that would fit with just about any vise on the planet. The second challenge was finding a tool that can both shanks and some tubes. By unscrewing the chuck housing, you can flip the inner chuck one way for shanks and the other way for tubes. The shank will hold shanks down to our Micro Shanks, which are 0.90mm in diameter. Tube adaptor inner diameter: 2mm.