Before using the vise, install both Quintus 2 pull-down bolts in the vise's M10 counterbored bottom locating holes (order separately – see Dimensions page for part number). To locate and clamp the vise, the Quintus 2 riser utilizes these two pull-down bolts – #1 with zero-point centering, #2 with single-axis centering. First, turn Quintus mechanism #1, then turn Quintus mechanism #2. Each exerts 4500 lbs of force on its pull-down bolt. See Related Products below for mounting accessories.