4" Riser Assembly gets the D-DRIVE™ Vise up and makes parts more accessible to the spindle. The Riser Assembly is the best of both worlds: works with the D-DRIVE™ Vise, but is also a mini-UCMF, with quick-change capability, making it capable of working with other tooling/ applications.  Can be used with or without Invert-A-Bolt™ fasteners both in connecting TO something or connecting WITH something.