T-slot nuts

M6 30 Series Metal T-slot Nut Sliding Block Slot Nuts Silver Tone 10pcs

T slot nuts became cheaper and more affordable and maybe that's why I can't find these

m68 slot Slot nut with tongue slot 10 M6 B type,accessories,aluminum profiles,strut profiles,slot nut,hammer nut,machine building profiles

m6 t slot nut Fath M6 Roll in T-Slot Nut for #8 Stainless