Designed to turn your trusty HMH Standard or HMH Spartan into a dedicated in-line full-rotary tube fly vise, the handy HMH Tube Vise Converter is great. Simply level your adjustable angle HMH vise head then remove your traditionally configured jaws from the vise barrel, insert and then thread the Tube Vise Converter securely into place, and start tying tube flies in style! Sold complete with Premium Stainless Steel Mandrels (.041 and .062 inch diameters) and detailed user instructions included, the HMH Tube Vise Converter is sure to please.