Are T-slot tables necessary and is it worth paying more for steel?

Steel T Slots - McMaster-Carr t slot steel T-slot nuts STN are used for setting up work on machine tools They are also used with stud sets and have numerous applications on jig and fixture wor triple royal gold slot Material: Carbon steel grade 10, EN AW-7075 or stainless steel

treasure of tengshe slot This T-Slot Nut made of stainless steel can be twisted into place at any point along the Line 5 profile groove and is held in position by a spring-mounted