The Tube Vise Converter tool will easily convert your HMH vise with screw-in / screw-out jaws to an in-line rotary tube vise. It offers a whole new way to hold tubes by chucking them directly in the steel jaws. Mount tubes with or without junction tubing installed; with or without pins / mandrels. The sleeker design lets you take full advantage of the in-line rotary ability, and makes it easier to get materials on top, bottom, and sides of the pattern unencumbered by the tool holding the tube. Comes with 2 premium mandrels, sample tubes, and tube fly hook samples. Made in the USA.