This Danvise Fly Tying Vise vise is a great value in a "true"rotary vise. True rotary means that the hook can be placed in the jaws with the shank aligned with the axis of rotation so the shank doesn't wobble when you rotate the hook in the vise. Much easier to wrap thread, chenille, hackle or dubbing loops! Most parts of the vise are made of molded Delrin resin, a very strong, lightweight material that makes the vise easy to carry and store. The steel jaws hold hooks ranging from size 28 up to 2/0 securely. The vise stem has a diameter of 10mm (0.393 inch) and is adjustable up to a full 6 1/2 inch and has a C-clamp base. A bobbin rest is included.