I Type, Slot 8, M5 thread on the nuts. Suitable for 40x40 aluminium profiles. Works on all PRO SIMRIG aluminium profiles and those from other vendors using the standard 40x40 I Type profile (slot 8). These are spring loaded roll-in t-slot nuts. This means you can "roll them" (push them) into the top of the slot, rather than having to load them in from the en
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