I Type, Slot 8, M8 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 ends of the profile which is not always possible.
The spring loaded ball bearing allows easy placement whilst you tighten down the bolt.
Price is for a pack of 10