Grip-Master SV Series Vises (Heinrich) The SV Series is for general vise and fixture use, and these vises are identifiable by their black knobs. The Grip-Master SV Series is for general vise and fixture use, and these vises are identifiable by their black knobs. A press on the locking lever actuates the eccentric crank, which tilts the locking ring. It grips the entire circumference of the center bar, forcibly moving the jaw forward against the workpiece. Made in USA.
