Double "T" nut

[Frank S]

When using these elongated multiple holed "T" nuts there is one other significant advantage particularly on a slotted flat rotary table they all for greatly expanding the useable diameter. If a dog point grub screw is inserted into the inner most hole and snugged down when you then use the hole that is outside of the table diameter or outside of a slot on your drill table as your clamping position, you are not nearly as likely to break out the end of the slot