B) The Grip-All Jaws Bench Vise System
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No matter how well made your bench vise is or how tight you clamp something, unless your work piece has parallel sides, your vise jaws can't hold it securely.
Grip-All Jaws can hold any shape safely and securely enough to use power tools yet it won't mar your work. This version is designed to work with most standard bench vises.
The kit includes everything you need to adapt your bench vise to hold any shape. You can also use you vise normally without the pivot arms. Check out the video below. Video instructions for installation begin at about 4:30.
Unless specified, the vise jaw block is 8" wide.