Why use expensive T-slot extrusion? - Hardware

Aluminum extrusion with T or V slot Assembly aluminum extrusion t slot Best Selling ; 8020 72 T-Slotted Profile - Silver $ New ; 8020 103072 T-Slotted Metal Extrusion $ New ; 8020 1515-ULS-72 x aluminum t slot plate So one of the industrial plants I work in has scrapped a HUGE amount of aluminum T-slot extrusion and I have free reign over picking through

aluminum extrusions t slot 20x20 T Slot Aluminum Extrusion Profile Silver Black