Slotted uprights are the basic element for accessorizing Treston tables. Accessories are attached to Treston tables with the aid of slotted uprights or a pre-assembled slotted upright module. The uprights or the module are attached to the back of the table. Slotted uprights are also available as a retrofit to existing non-Treston tables. The module is extended with an upright ,  horizontal tube and a "T" bracket.