The Hinged Stem are designed to allow the fly tyer to pivot the vise and still use the rotary feature.
Stems are vise specific and designed either for c clamps (8") or pedestal bases (6"). The Tightening Knob on the Hinged Stem is also available in 2 different colors, anodized clear and anodized black which you can select to best match your existing vise.
Made in the USA