Aluminum Extrusion T-Slot Table Plates

Aluminum Extruded Tubing 10mm T Slot Aluminium Frame Profile t slot tubing T-Slot Aluminium Extrusion Profile triple diamond slot review Why are there no steel version of T slot extrusions? And why don't people use steel RHS or SHS tubes with clamps? Be straight and rigid af

thai slot pg My question is - why use expensive extruded aluminum T-slot? I mean, for a CNC router it makes sense because you need sub-millimeter accuracy,