Our Heavy Duty Base pair with 2 inch uprights. They are ideal for support tall Drape Supports, handing heavier fabric panels and for high traffic areas where tip over may occur. They offer the most durablity and support for your Pipe and Drape System. Heavy Duty Bases do not come with Stacking Slots, but they can be added for a small fee if this is important to you for storage needs. Heavy Duty Bases pair with our Slip Fit Uprights that go up to 20ft high!