T-Slot Nuts and Bolts for profile rails

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Everything I see online is steel Will aluminum not hold up? Thinking of making my own for my Pratt & Whitney 3C

the slot golf Item, Half Round Nut Spring block PN--JM: F4101-P-M4F4101-P-M5 Material, Steel Slot, 6mm Surface treatment, Nickel Plating Thread, M4M5

tecno spark 9 price in nigeria slot T-Slot Nut Sliding Block swivel-in with spring Slot 8 - Type B