The function of all riser blocks in general is to lift up the workpice form the fixture base to
- Enable easier access to workpice
- Protect the Multi-Rail base’s serration
Riser blocks can also be called parallels, if their purpose is to align the workpiece with the Multi-Rail base like here.
These parallels are installed on a Multi-Rail base using a screw and a T-nut which are included.